Environment-Clean-Generations

Environment-Clean-Generations
THE DEFINITIVE BLOG FOR EVERYTHING YOU NEED TO KNOW ABOUT THE ENVIRONMENT YOU LIVE IN, WITH REFERENCE TO LIFE, EARTH AND COSMIC SPACE SCIENCES, PRESENTED BY ENVIRONMENTAL ENGINEER DORU INDREI, ENVIRONMENTAL QUALITY AND ENERGY SPACIALIST
"Life is not about what we know, but what we don't know, craving the unthinkable makes it so amazing, that is worth dying for." Doru Indrei
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Showing posts with label moon. Show all posts
Showing posts with label moon. Show all posts

The 51st State Should be The Moon


At the sunset of Newt Gingrich’s putative presidency, the moon would be the 51st state, colonized by permanent American settlers. Tourists would honeymoon in low-Earth orbit, space factories would manufacture goods in microgravity, and America would have a rocket powerful enough to send us to Mars.

This is all according to a discussion Gingrich hosted Wednesday in Florida, which holds its presidential primary next Tuesday and which lost thousands of jobs as the space shuttle program drew to a close last year. But this is Gingrich talking, so it’s safe to say this isn’t all politics. A self-professed space nut and fan of science, Gingrich has dreamt of a lunar colony for decades. Even if this dream is inherently irrational:

“The reason you have to have a bold and large vision is you don't arouse the American nation with trivial, bureaucratically rational objectives,” Gingrich said.

It's odd for a politician to trump his own ideas as grandiose and not rational. But hey, going back to the moon sure fires up the patriots! So America's space goals are once again a political football — one, incidentally, that seems to rev up Republicans more than it does Democrats. Gingrich has a long list of space dreams, which we'll get to in a minute. But this debate brings to light an interesting volley since the Reagan administration, between Democratic presidents who seem not to really dwell on America’s space ambitions and Republican presidents (and would-be presidents) who just love the idea of Americans on the moon.


Dubbing himself a “visionary” for his space plans, the former House speaker and GOP presidential hopeful compared himself to John F. Kennedy, Abraham Lincoln and the Wright brothers. But he didn’t compare himself to another conservative Republican, George W. Bush, who also wanted the U.S. to go back to the moon as a launch pad for Mars. His new vision was gestated in the wake of the Columbia disaster, and centered on the retirement of the aging shuttles, but it also sought a more ambitious future for the space agency. The Constellation program never really got off the ground, however, and critics found plenty of faults.


But contrast this with Bill Clinton's presidency. While he was in the Oval Office, the U.S. partnered with Russia to build the International Space Station — certainly a major achievement, but it was arguably more impressive for its geopolitics than its science scope. Both countries already had space stations before, and the ISS took way more time and money to build than anyone had anticipated. Otherwise, Clinton apparently didn’t have much to say about the space program, even in his autobiography “My Life.”

Then, a while after taking office and organizing a blue-ribbon NASA review commission, President Obama harrumphed at the idea of returning to the moon — “we’ve been there before,” he famously said — and charted a bumpy course for a future NASA that will eventually visit an asteroid and someday Mars.
Now Gingrich has set his sights back on our natural satellite, with a much tighter timeline. But there is one catch — he favors private development, not necessarily NASA leadership.

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As Charles Houmans notes in Foreign Policy, the space program presents a conundrum for dedicated conservatives. It’s the most unassailably awesome achievement in American history, and as such it’s fertile ground for jingoists. But it’s also plagued by huge federal spending overruns, a risk-averse bureaucracy and — let us not forget — scientists, whose findings do not always comport with the conservative worldview. Gingrich seems able to toe this boundary carefully, coupling his love of science and space with his free-market beliefs. 


In a debate earlier this week, he said privately funded prizes spurred Charles Lindbergh and Burt Rutan to reach new milestones, and private incentives could do the same for lunar settlement and Mars exploration.

For his part, his rival Mitt Romney has been a little more vague and a little more NASA-centric, discussing a space agency with more partnerships with universities and commercial enterprises.


Wednesday’s talk is just the latest in a long list of Gingrich’s space ideas, some of which are wackier than others. In 1981 he sponsored an unsuccessful bill called the National Space and Aeronautics Policy Act, which set forth “provisions for the government of space territories, including constitutional protections, the right to self-government and admission to statehood,” the New York Times reported in 1995. He proposed a lunar mirror network that would illuminate highways and dark alleyways. He envisions space factories creating new opportunities for the unemployed. 


“If we’d spent as much on space as we’ve spent on farm programs, we could have taken all the extra farmers and put them on space stations working for a living ... in orbiting factories,” he told a science fiction convention in 1986.

But other predictions and desires have borne out. A quarter-century ago he said “space tourism is coming,” predicting Hiltons and Marriotts of the solar system. There are no space hotels yet, but space tourism is likely just around the corner.


So does anyone really think a president Gingrich would set up a successful moon base? Not really, especially given this country's economic situation and (depending on whose hyperbole you believe) debt crisis. Gingrich has given no indications of how he'd pay for it, incentives or otherwise, and the details are sparse. And most of the reaction from space observers has been tepid at best.


Space policy expert John Logsdon, professor emeritus at George Washington University, called it a "fantasy," according to Space.com. "It would be much better to set realistic goals, but that is not Mr. Gingrich's strong suit," he said.


But you can hand Gingrich one thing: At least he's talking about American leadership in space, something that's been sorely lacking of late. Maybe his grandiose visions will start a real conversation.

New Hope for Life on Europa


 Evidence from a Nasa space probe suggests that Europa, the frosty moon of Jupiter, hides great lakes of liquid water just beneath its outer shell of ice. This gives new hope that the satellite's deep ocean of water could harbour life.
The information comes from the unmanned Galileo spacecraft, which arrived at Jupiter and its moons in 1995. It was the first spacecraft to investigate the Jovian system, revealed fresh information about the gas giant's atmosphere and sent back mountains of data to analyse.


It also returned evidence that one moon -- Europa -- hides an enormous ocean of liquid water, deep beneath the ice. It potentially contains more water than all of the Earth's oceans combined, but lying tens of miles beneath a shell of impenetrable ice made it seem unlikely to harbor life.
But fresh data reveals that there is a dramatic exchange between Europa's icy shell and the ocean beneath, and evidence for giant lakes just beneath the moon's surface. This would allow nutrients to easily travel between the surface and the ocean beneath, giving new hope that life could flourish in Europa's seas.
The data comes from Galileo images of an example of something that astrogeologists refer to as chaos terrain -- two roughly circular, bumpy features on Europa's surface. From looking at similar processes on Earth in ice shelves and under glaciers overlaying volcanoes, we can speculate about the geological process on Europa.

It suggests that the warmer water in the ocean beneath has welled up, which causes the surface ice to melt. This forms fractured cracks and jagged mounds of ice, and leaves behind massive lakes of water.
"The data opens up some compelling possibilities," said Mary Voytek, director of Nasa's Astrobiology Program at agency headquarters in Washington. "However, scientists worldwide will want to take a close look at this analysis and review the data before we can fully appreciate the implications of these results."


Europa is on the drawing board for another investigatory mission in the next decade. Nasa plans to launch the $4.7 billion Jupiter Europa Orbiter in 2020, with the intention of reaching the Jovian system in 2025. The probe would use an ice-penetrating radar to see exactly what lies beneath the moon's frigid shell.

China Rushing to the Moon


Is China on course to surpass the United States as the world's space superpower and stake a claim on the moon in the next 15 years? Billionaire space executive Robert Bigelow is deeply worried about that scenario — and he says Americans need a "kick in the ass" to respond to the challenge.

 A scale model shows Bigelow Aerospace's proposed lunar colony, made from inflatable modules, with a fleet of lunar landers in the background.

Bigelow delivered that kick today at the International Symposium for Personal and Commercial Spaceflight in Las Cruces, N.M. — but the general consensus among experts on China policy is that it's a bit too early to start rattling the sabers.

The founder of the Budget Suites hotel chain and Bigelow Aerospace promised to "cause a stimulation" with his remarks at the ISPCS conference, and delivered on that promise by laying out an argument for China's growing space dominance. He said the trend could conceivably lead to a lunar takeover in the 2022-2026 time frame.

Bigelow characterized China as "the new gunslinger in Dodge" when it came to space exploration.
The way he sees it, China is progressing along a slow, steady path toward space proficiency. The steps in that path include follow-ups to the Shenzhou 8 spacewalk mission in 2008, the unmanned Chang'e lunar missions and last month's Tiangong 1 space lab launch. In the coming years, China will have plenty of cash for great leaps forward in space, while the United States will be hamstrung by higher debt and tighter budgets.

Why the moon?

Why would China want to lay claim to the moon? Bigelow referred to some of the long-discussed potential benefits, including the moon's abundance of helium-3, which could someday be used as fuel for nuclear fusion (although that idea has been oversold in the past). The moon's raw material could also be turned into the water, oxygen, building materials and rocket fuel needed for human exploration. But Bigelow said the biggest payoff would come in the form of international prestige, just as it did for the United States after the moon landings.

 "This would endure for a very long time," he said. "It’s priceless. ... Nothing else that China could possibly do in the next 15 years could produce as great a benefit."
Bigelow speculated that China could conduct detailed surface-based surveys of the lunar surface in the mid-2020s, setting the stage for the country to withdraw from the Outer Space Treaty of 1967 and formally claim possession of the moon. China could then conceivably insist on being paid for lunar concessions, Bigelow said.
He said the Chinese challenge could serve as a "fear factor" to energize the efforts of NASA and its space partners. "It's the best kick in the ass that you can have," he told reporters after his talk. He also doubted that the Chinese would be content with taking on the status of a partner in the U.S.-led space "family," even if they were invited to join. "They want to have their own family," he said.

Bigelow Aerospace's Robert Bigelow worries that China will lay claim to the moon in the 2020s. (photo)
Bigelow proposed diverting 10 percent of the U.S. defense budget to the space effort, which he said would provide an annual boost of $60 billion. It may turn out to be "too late" for a space race to the moon, he said; Bigelow suggested that a U.S.-led consortium should target Mars instead.

What do the experts say?


Bigelow said his analysis was based on two years of observing the space policy landscape, rather than personal discussions with the Chinese. Generally speaking, experts on Chinese space policy say that it's too early to judge the nation's long-term intentions.

"I think it is a little bit of a stretch to think about whether the Chinese will be laying claim to the moon," Dean Cheng, a research fellow at the conservative-leaning Heritage Foundation, told me today. "I would be very surprised if they had any plans one way or the other."

Cheng said the Chinese were clearly interested in lunar exploration. "They will have all the pieces in place in the 2021-2025 time period to think about putting a man on the moon," he said. But he doubted that China would try to do anything inflammatory — for example, rolling up the American flag at Tranquility Base and putting a Chinese flag in its place. "Incendiary stuff, not likely," Cheng said.

It's more likely that China would want to see an international body such as the United Nations in charge of lunar exploration and exploitation, Cheng said. He pointed to the example of the Law of the Sea Convention, which governs the use of marine resources but has not yet been ratified by the U.S. Senate.

Cheng said the Chinese would prefer to see lunar resources controlled by an intergovernmental body rather than private-sector entities. He said they'd definitely oppose an arrangement in which non-governmental entities are in charge, such as the system set up by ICANN, the Internet's governing body.

"The prospect of the Chinese having to deal with the space equivalent of ICANN is their worst nightmare," he told me.
Other observations from Robert Bigelow:

  • For years, Bigelow has been working on inflatable space modules based on technology developed by NASA, and two of the modules have been lofted into orbit by Russian rockets. Bigelow said the Genesis 1 and 2 modules were no longer providing useful data, but that they were designed to stay in orbit for 12 years. That suggests that the modules would make their re-entry no earlier than the 2018-2019 time frame. 
  • Bigelow had planned to make habitable orbital modules available to international clients starting in late 2014. But today, he told reporters that the schedule has been put on hold, due to the economic downturn as well as questions about the availability of private spaceships capable of servicing the habitats. Once the decision is made to resume the project, it would probably take no more than three years to launch the modules, Bigelow said.
  • Bigelow said the workforce at Nevada-based Bigelow Aerospace has been reduced from 115 workers to 51, due to the slowdown in work on the inflatable modules.
  • Bigelow Aerospace has its own plan to put a colony on the moon. In the ISPCS exhibit hall, the company displayed a scale model of a base made up of inflatable modules that Bigelow said could be assembled in deep space and then transported to the lunar surface. "What was once a station lands as a base," he explained. For now, however, there are no plans to turn the concept into an actual base.
by "environment clean generations"

Tunnel on the Moon


Following the discovery that the Moon's surface may hide a network of underground tunnels, a veteran Russian cosmonaut has plans to set up a colony of in this labyrinth of lava caves.

In 2008, Japan's Kaguya spacecraft unveiled a mysterious, metres-deep cave in the Sea of Tranquility. Nasa went back with its Lunar Reconnaissance Orbiter Camera (LROC) and snapped high resolution images of the enticing pit.



"They could be entrances to a geologic wonderland," Mark Robinson of Arizona State University, principal investigator for the LRO camera, said in 2010. "We believe the giant holes are skylights that formed when the ceilings of underground lava tubes collapsed."


Those long-dead lava tubes -- a vestigial signature of the Moon's explosive volcanic past -- could still remain as a labyrinth of underground tunnels. These, Russian space pioneers reckon, would be a perfect, natural shelter from hazardous outer-space conditions.


"If it turns out that the Moon has a number of caves that can provide some protection from radiation and meteor showers, it could be an even more interesting destination than previously thought," cosmonaut Sergei Krikalyov was quoted as saying by Reuters, at a forum on the future of manned spaceflight. Krikalyov now heads Russia's Star City cosmonaut training centre outside Moscow.



Instead of building walls and ceilings, or digging into the lunar soil, Krikalyov's plan is to send lunar explorers into the tunnels with inflatable tents. Once there, the blow-up module expands until its hard outer shell seals the tunnel.

Boris Kryuchkov, the deputy science head at the training centre, estimates that the first lunar colony could be built by 2030.


North America, on the other hand, isn't that interested in returning to the Moon. President Obama cancelled the lunar project in 2010 saying, "We've been there before. There's a lot more of space to explore." Instead, he wants Nasa to focus on landing on an asteroid by 2025, and eventually send a manned mission to Mars.
by "environment clean generations"

Satellites Orbiting The Earth. Tell me more!

Satellites are, to some degree, "mysterious" objects. They travel in space, which feels like an exotic place because most of us have never been there. They are so far away that we cannot see them. They usually cost millions or billions of dollars, which means none of us will ever own one personally. And so on…


Orbital mechanics can also be mysterious because there is no easy way for us to experience orbital mechanics personally. However, with a little imagination, you can understand the basic idea behind orbital mechanics very easily. It turns out that we play with orbital mechanics all the time!

Think about what happens when you throw a ball. Imagine that you are standing in a big field and throw a baseball as hard as you can -- like a pitcher. The ball might go 100 feet (30 meters) and then hit the ground. You put the ball in orbit -- It's just that a ball's orbit is very short!
Now imagine that you shot a rifle straight and level instead of throwing a ball. The bullet might travel a mile (1.6 km) before succumbing to gravity and hitting the ground.

Now imagine that you shoot a very large cannon that is able to give its shell an extremely high initial velocity. Also imagine that our world is completely covered in water to remove any worries about hills, and that the cannon is shot straight and level. Its path might look like the image to the right.
­ In this diagram you can see that the shell is going far enough to actually follow the curve of the earth for a period of time before hitting the ground.

One thing that gums these examples up is air resistance, so imagine that you took this cannon to the moon and mounted it on top of the highest mountain. The moon has no atmosphere and is completely surrounded by the vacuum of space. If you adjusted the speed of the shell just right and shot the cannon, the shell would follow the curve of the moon perfectly.

It would fall at exactly the same rate that the curve of the moon falls away from it, so it would never hit the ground. Eventually it would curve all the way around the moon and ram right into the back of the cannon! On the moon you could actually have satellites in extremely low orbits like that -- just a mile or two off the ground to avoid the mountains. And satellites could conceivably be launched from cannons.

On earth, it's not so easy because satellites have to get up above the atmosphere and into the vacuum of space to orbit for any length of time. 200 miles (320 km) up is about the minimum to avoid atmospheric interference. The Hubble space telescope orbits at an altitude of 380 miles (600 km) or so. But the principle is exactly the same. The speed of the satellite is adjusted so that it falls to earth at the same rate that the curve of the earth falls away from the satellite. The satellite is perpetually falling, but it never hits the ground!

It would fall at exactly the same rate that the curve of the moon falls away from it, so it would never hit the ground. Eventually it would curve all the way around the moon and ram right into the back of the cannon! On the moon you could actually have satellites in extremely low orbits like that -- just a mile or two off the ground to avoid the mountains. And satellites could conceivably be launched from cannons.

On earth, it's not so easy because satellites have to get up above the atmosphere and into the vacuum of space to orbit for any length of time. 200 miles (320 km) up is about the minimum to avoid atmospheric interference. The Hubble space telescope orbits at an altitude of 380 miles (600 km) or so. But the principle is exactly the same. The speed of the satellite is adjusted so that it falls to earth at the same rate that the curve of the earth falls away from the satellite. The satellite is perpetually falling, but it never hits the ground!
by "environment clean generations"

If There Were No Gravity On Earth?



Gravity is one of those things we take completely for granted. And there are two things about it that we take for granted: the fact that it is always there, and the fact that it never changes. If the Earth's gravity were ever to change significantly, it would have a huge effect on nearly everything because so many things are designed around the current state of gravity. 

Before looking at changes in gravity however, it is helpful to first understand what gravity is. Gravity is an attractive force between any two atoms. Let's say you take two golf balls and place them on a table. There will be an incredibly slight gravitational attraction between the atoms in those two golf balls. If you use two massive pieces of lead and some amazingly precise instruments, you can actually measure an infinitesimal attraction between them. It is only when you get an gigantic number of atoms together, as in the case of the planet Earth, that the force of gravitational attraction is significant.  

The reason why gravity on Earth never changes is because the mass of the Earth never changes. The only way to suddenly change the gravity on Earth would be to change the mass of the planet. A change in mass great enough to result in a change in gravity isn't going to happen anytime soon. 

Could we survive without gravity?

But let's ignore the physics and imagine that, one day, the planet's gravity turned off, and suddenly there was no force of gravity on planet Earth. This would turn out to be a pretty bad day. We depend on gravity to hold so many things down -- cars, people, furniture, pencils and papers on your desk, and so on. Everything not stuck in place would suddenly have no reason to stay down, it would start floating. But it's not just furniture and the like that would start to float. 

Two of the more important things held on the ground by gravity are the atmosphere and the water in the oceans, lakes and rivers. Without gravity, the air in the atmosphere has no reason to hang around, and it would immediately leap into space. This is the problem the moon has -- the moon doesn't have enough gravity to keep an atmosphere around it, so it's in a near vacuum. Without an atmosphere, any living thing would die immediately and anything liquid would boil away into space. 

             Without gravity, the water in oceans, rivers and lakes would disappear, leaving Earth with no water supply.

n other words, no one would last long if the planet didn't have gravity.
If gravity were to suddenly double, It would be almost as bad, because everything would be twice as heavy. There would be big problems with anything structural. Houses, bridges, skyscrapers, table legs, support columns and so on are all sized for normal gravity. Most structures would collapse fairly quickly if you doubled the load on them. Trees and plants would have problems. Power lines would have problems. The air pressure would double and that would have a big effect on the weather.
What this answer shows you is just how integral gravity is to our world. We can’t live without it, and we can't afford to have it change. It is one of the true constants in our lives!.

by "environment clean generations"

If I Drilled a Tunnel Through the Center of the Earth and Jumped Into It?



Although it would be impossible to do this on earth, you actually could do this on the moon. The moon has a cold core and it also doesn't have any oceans or groundwater to mess things up. In addition, the moon has no atmosphere, so the tunnel would have a nice vacuum in it that eliminates aerodynamic drag. 

So, imagine that the tunnel through the moon is 20 feet (7 meters) in diameter. Down one side is a ladder. If you were to climb down the ladder, what you would find is that your weight decreases. Gravity is caused by objects attracting one another with their mass. As you descend into the tunnel, more and more of the moon's mass is above you, so it attracts you upward. Once you climbed down to the center of the moon you would be weightless. The mass of the moon is all around you and attracting you equally, so it all cancels out and you would feel weightless. 

If you were to actually leap into the tunnel and allow yourself to fall, you would accelerate toward the center to a very high speed. Then you would zoom through the center and start decelerating. You would eventually stop when you reached the tunnel's lip on the other side of the moon, and then you would start falling back down the tunnel in the other direction. You would oscillate back and forth like this forever. 

If you could do this on earth, one amazing effect would be the ease of travel. The diameter of the earth is about 12,700 kilometers (7,800 miles). If you drilled the tunnel straight through the center and could create a vacuum inside, anything you dropped into the tunnel would reach the other side of the planet in just 42 minutes! 

by "environment clean generations"

To The Moon with NASA Twin Science Probes


An unmanned Delta 2 rocket blasted off from Cape Canaveral Air Force on Saturday to send a pair of NASA science probes on their way to the moon.

After being delayed two days by poor weather and to review technical data after Thursday’s launch scrub, the 124-tall rocket bolted off its seaside pad at 9:08 a.m. EDT on Saturday, darting through partly cloudy skies as it headed into orbit.

The twin satellites, each weighing 677 pounds, are headed to a point in space about 1.5 million kilometers (932,0570 miles) away where gravitational pull from the sun and Earth balances out.


From there, the Gravity Recovery and Interior Laboratory, or GRAIL, satellites will make a long, slow approach to the moon, arriving on Dec. 31 and Jan 1.

More than 100 spacecraft already have been to the moon, including six with U.S. astronauts, but one key piece of information about Earth’s natural satellite is still missing -- what’s inside. That’s the focus of the GRAIL mission.

After a few months to maneuver into the proper orbit, the pair will spend 82 days flying over the lunar poles, linked by radio waves.

When one spacecraft flies over a region of higher gravity, it will speed up, momentarily changing the distance between itself and its sibling probe. Less dense regions likewise will impact the satellites’ positions. Using the radio waves as a ruler, changes as tiny as a micron -- the width of a red blood cell -- can be detected.

The gravity maps will be compared with topographical features and other data to piece together the moon's history.


Overall, the moon has about one-sixth the gravity of Earth, but it is not evenly distributed. On the moon, a mountain actually might be a molehill, gravitationally speaking.

“Sometimes you’ll see a big mountain and you’d expect a high gravity signal, but in reality you get no (extra) gravity signal,” said Sami Asmar, GRAIL deputy project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, Calif.

“That’s where it gets interesting,” he added. “The planet (moon) has compensated for the weight of this load for a net zero effect.”

Likewise, gravity maps of lunar flatlands show unexplained pockets of extra heft, an indication of subterranean deposits or structures. Learning the interior structure of the moon is considered critical to piecing together the story about what happened to the moon since its formation some 4.5 billion years ago.

Scientists believe the moon’s building blocks were large chunks of debris jettisoned from Earth after a collision with an object as big as Mars. In addition to unraveling the moon's history, GRAIL scientists expect to extrapolate their findings to other rocky bodies, both in our solar system and eventually to those beyond.

by "environment clean generations"

What Is Asteroid Mining?



If you enjoy science fiction, then you know that the thought of colonizing the moon makes for some incredibly imaginative stories. But there is a good possibility that lunar cities will become a reality during the 21st century! Colonizing Mars is another option as well. 

Right now, one of the biggest problems with the idea of a moon colony is the question of building supplies. There is no Home Depot on the moon, so the building supplies have to come from somewhere. The only place to get the supplies right now is the Earth, with the space shuttle acting as a truck. Using the space shuttle in this way is something like using FedEx to get all of the materials for building a house to a construction site -- It's incredibly expensive and not very efficient!  

Asteroids may be a much better place to get the supplies. Early evidence suggests that there are trillions of dollars' worth of minerals and metals buried in asteroids that come close to the Earth. Asteroids are so close that many scientists think an asteroid mining mission is easily feasible. Several international organizations are developing plans for going up to get these natural space resources.

  


Strip-mining equipment extracts iron and other raw materials from an asteroid. In the foreground, a mining cart transports the materials to a processing plant.






 Scientists think asteroids are leftover material from the early formation of the solar system or debris from the destruction of a planet. There are tens of thousands of asteroids circling the sun. Most are grouped inside the asteroid belt, between the orbits of Mars and Jupiter. Some asteroids that stray from this orbit, though, flying close to Earth on occasion -- you've probably heard about the possibility of these asteroids smashing into Earth in the future, as in the movie "Armageddon." 

Most asteroids fit into three basic categories:
  • C-type - More than 75 percent of known asteroids fit into thins category. The composition of C-type asteroids is similar to that of the sun without the hydrogen, helium and other volatiles.
  • S-type - About 17 percent of asteroids are this type. These contain deposits of nickel, iron and magnesium.
  • M-type - A small number of asteroids are this type, and they contain nickel and iron. 
Even without a manned mission to do a full-scale study of an asteroid, scientists know a lot about what asteroids contain. Astronomers use telescopic spectroscopy, which analyzes light reflected from the asteroid's surface, to find out what might be there. In addition to iron, nickel and magnesium, scientists think water, oxygen, gold and platinum also exist on some asteroids. 

Water interests space explorers most because it could help keep a space colony alive. Without water, there is really no way to move forward with human exploration of space. Water could also be broken down into hydrogen and oxygen to form rocket engine propellant. The metal ore on the asteroids could be mined and used for building spacecraft and other structures for a space colony. 

Corporations that might not be interested in exploring space for the adventure and science could be interested in the treasures that a space mining operation could send back to Earth. One NASA report estimates that the mineral wealth of the asteroids in the asteroid belt might exceed $100 billion for each of the six billion people on Earth. John S. Lewis, author of the space mining book Mining the Sky, has said that an asteroid with a diameter of one kilometer would have a mass of about two billion tons. There are perhaps one million asteroids of this size in the solar system. One of these asteroids, according to Lewis, would contain 30 million tons of nickel, 1.5 million tons of metal cobalt and 7,500 tons of platinum. The platinum alone would have a value of more than $150 billion! 



Asteroids have amazing potential for industry. But what will it take to land on an asteroid, find these valuable materials, extract them and process them? In the next section, you will find out how asteroid mining operations might supply the Earth and its colonies on other planets with a plenitude of materials. 
  
Asteroid Extraction and Processing

The drive to set up a mining operation on an asteroid is a matter of simple economics. While building an asteroid mine will cost billions of dollars, it will be far cheaper than carrying supplies from Earth to the moon or Mars

Spacecraft would have to carry food and supplies for the mining crew and the equipment for the mine. Newly developed spacecraft should make landing on an asteroid possible. After all, we have already landed on the moon, and some asteroids pass by closer than the moon. A spacecraft going to an asteroid would need less rocket power and fuel than one going to the moon. 

One problem will be how to keep the asteroid from rotating while it's being mined. Some experts suggest attaching rockets to the asteroid to take the spin out of it. But once miners land on the asteroid, just how do they plan to dig on it, process the materials extracted and transport it to a space colony or to Earth? 

No one knows for sure what the first asteroid mine will look like, but here are some good assumptions:
  • The machinery will likely be solar powered, to reduce the need for fuel that would have to be hauled to the asteroid by spacecraft.
  • The equipment will also have to be lightweight to transport it to the asteroid.
  • Some experts, including Lewis, have favored using robotic equipment to limit the personnel needed to carry out the mining project. This would reduce the amount of supplies, like food, required for a manned mission.
  • Miners on asteroids would use techniques similar to those used on Earth. The most likely method would be to scrape desired material off the asteroid, and tunnel into veins of specific substances. Scraping, or strip mining, will pull out valuable ore that will float off the asteroid.
  • Because much of the ore will fly off, a large canopy might be used to collect it.
  • Asteroids have nearly no gravity, so the mining equipment, and the astronaut-miners who operate it, will have to use grapples to anchor themselves to the ground. However, the lack of gravity is an advantage in moving mined material around without having to use much power.
  • Once a load of material is ready to be sent to either Earth or a space colony, rocket fuel for a ferrying spacecraft could be produced by breaking down water from the asteroid into hydrogen and oxygen.
  • After an asteroid's minerals and resources have been exhausted by the mining project, the equipment can then be transported to the next asteroid. 
Because of the lack of gravity and atmosphere, ferrying the newly mined materials to the moon will be easy. Once there, they can be refined and formed into structures! 



 by "environment clean generations"

YU55 Asteroid Flyby On 8-9 November


The third near-earth asteroid of 2011 will pass between the moon and earth later this year, NASA has confirmed.

The 1300-foot-wide  (400 metres) asteroid, which is more than one and a half times the length of a soccer pitch, will pass within 0.85 lunar distances of the Earth on November 8, 2011.

Discovered on December 28, 2005 by Robert McMillan of the Spacewatch Program near Tucson, Arizona, 2005 YU55 is believed to be a very dark, nearly spherical object.

According to NASA’s Near Earth Object Program: “Although classified as a potentially hazardous object, 2005 YU55 poses no threat of an Earth collision over at least the next 100 years. However, this will be the closest approach to date by an object this large that we know about in advance and an event of this type will not happen again until 2028 when asteroid (153814) 2001 WN5 will pass to within 0.6 lunar distances.”
While neither the European Space Agency (ESA) nor NASA has suggested that YU55 poses a threat to Earth, plans to develop a mission to counteract a potential asteroid collision in the future are already underway.

The Daily Mail reported on Tuesday that the ESA is planning to fire an ‘impactor’ satellite into a ‘test’ asteroid in 2015 to see if the object’s trajectory can be altered.  The Agency is conducting the test mission in light of the minimal threat posed by the 700-1100-foot-wide 99942 Apophis asteroid, which has a one in 250,000 chance of impacting Earth in 2036.
Other Recent Asteroid Encounters

In late June 2011, earth experienced one of its closest encounters with an asteroid in recent years. But as NASA indicated in the days ahead of the ‘cosmic close call’, the encounter was so close that Earth’s gravity sharply altered the asteroid’s trajectory and prevented the space rock from impacting the planet.

2011MD, a newly discovered asteroid passed within 12,000 kilometres (7,500 miles) of Earth. The asteroid was only sighted for the first time on 22 June by a robotic telescope in New Mexico, USA. The International Astronomical Union’s Minor Planet Center in Massachusetts, USA, put out an alert Thursday.
It was daylight in the UK and Ireland (12.30 GMT) when the asteroid passed over the southern Atlantic Ocean, near the coast of Antarctica. The event was observable from South Africa and parts of Antarctica. It also was visible in the hours leading up to the closest approach across Australia, New Zealand, southern and eastern Asia, and the western Pacific.
Some media outlets proclaimed the asteroid to be as big as New York’s Empire State Building’. In fact, 2011 MD measured about 16 feet to 35 feet.
According to Minor Planet Center’s ranking charts 2011 MD’s trip was the fifth-closest recorded Asteroid event. The last asteroid to impact earth was ‘2008 TC3’ which was detected on 7 October 2008, just 19 hours before it burned up in the atmosphere over northern Sudan.
On 2 June, a 10-metre wide asteroid passed between the earth and moon.
Asteroid 2009 BD, which was first observed on 16 January 2009 passed approximately within 0.9 lunar distances (the distance between Earth and the Moon) of earth. Astronomers believe the rock is a rare “co-orbital asteroid” which follows the orbit of the Earth, not receding more than 0.1 AU (15 million km) away.
Two asteroids, several meters in diameter and in unrelated orbits, passed within the moon’s distance of Earth on September 8 2010. In April 2010 an asteroid roughly as long as a tennis court zoomed past Earth at about the distance of the moon. The space rock to pass at or within lunar distance previous to this was 2009 JL2, an asteroid about 17 to 37 metres across, in May 2009.
There is a roughly 50 percent chance of a 30-metre-wide plus asteroid striking Earth each century, according to Clark Chapman, a space scientist at the Southwest Research Institute in Boulder, Colorado, USA.
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NASA Moon Mission Preparations for September Launch



CAPE CANAVERAL, Fla. -- NASA's Gravity Recovery And Interior Laboratory (GRAIL) mission to study the moon is in final launch preparations for a scheduled Sept. 8 launch from Cape Canaveral Air Force Station in Florida.

GRAIL's twin spacecraft are tasked for a nine-month mission to explore Earth's nearest neighbor in unprecedented detail. They will determine the structure of the lunar interior from crust to core and advance our understanding of the thermal evolution of the moon.

"Yesterday's final encapsulation of the spacecraft is an important mission milestone," said David Lehman, GRAIL project manager for NASA's Jet Propulsion Laboratory in Pasadena, Calif. "Our two spacecraft are now sitting comfortably inside the payload fairing which will protect them during ascent. Next time the GRAIL twins will see the light of day, they will be about 95 miles up and accelerating."

The spacecraft twins, GRAIL-A and GRAIL-B, will fly aboard a Delta II rocket launched from Florida. The twins' circuitous route to lunar orbit will take 3.5 months and cover approximately 2.6 million miles (4.2 million kilometers) for GRAIL-A, and 2.7 million miles (4.3 million kilometers) for GRAIL-B.

In lunar orbit, the spacecraft will transmit radio signals precisely defining the distance between them. Regional gravitational differences on the moon are expected to expand and contract that distance.

GRAIL scientists will use these accurate measurements to define the moon's gravity field. The data will allow mission scientists to understand what goes on below the surface of our natural satellite.

"GRAIL will unlock lunar mysteries and help us understand how the moon, Earth and other rocky planets evolved as well," said Maria Zuber, GRAIL principal investigator from the Massachusetts Institute of Technology in Cambridge.

GRAIL's launch period opens Sept. 8 and extends through Oct. 19. On each day, there are two separate launch opportunities separated by approximately 39 minutes. On Sept. 8, the first launch opportunity is 8:37 a.m. EDT (5:37 a.m. PDT); the second is 9:16 a.m. EDT (6:16 a.m. PDT).

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the GRAIL mission. The Massachusetts Institute of Technology, Cambridge, is home to the mission's principal investigator, Maria Zuber. The GRAIL mission is part of the Discovery Program managed at NASA's Marshall Space Flight Center in Huntsville, Ala. Lockheed Martin Space Systems, Denver, built the spacecraft. Launch management for the mission is the responsibility of NASA's Launch Services Program at the Kennedy Space Center in Florida. JPL is a division of the California Institute of Technology in Pasadena.


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Neil Amstrong Says We Should Retun To The Moon


US astronauts Neil Armstrong and "Buzz" Aldrin deploy the US flag on the Moon in 1969. Astronaut Neil Armstrong has urged a return to the Moon to train for missions to Mars as the United States contemplates the future of its space programme following the end of the shuttle era.

The first man to walk on the Moon is due to address the on new directions for in coming weeks.

He has previously criticised US President for being "poorly advised" on space matters and said it was "well known to all that the American space programme is in some chaos at the present time, some disarray".

"There are multiple opinions on which goals should be the most important and the most pressing," he told a function in Sydney late Wednesday.


The US shuttle programme came to an end last month with the Atlantis cruising home for a final time, 42 years after Armstrong became the first person to set foot on the Moon as part of the .
Critics have assailed NASA for lacking focus, with no next-generation mission to replace the programme.

Now 81, Armstrong said the agency had become a "shuttlecock" for the "war of words" between the executive, legislative and congressional arms of US government.

"It’s my belief given time and careful thought and reasoning we will eventually reach the right goal, I just hope we do it fairly quickly," he said.

The normally private and reserved space veteran said should be the next frontier for exploration but urged more missions to the Moon as the vital next step.

US aviator and former astronaut Neil Armstrong, the first man to walk on the Moon, is due to address the US Congress on new directions for NASA in coming weeks.

"I do favour going to Mars but I believe it is both too difficult and too expensive with the technology we have available at the current time," he said. "I favour returning to the Moon. We made six landings there and explored areas as small as a city lot and perhaps as large as a small town. That leaves us some 14 million square miles that we have not explored."

 Armstrong said working on the Moon would allow scientists to practise "a lot of the things that you need to do when you are going further out in the solar system" while maintaining relatively close contact with Mission Control.

Communication is the major problem for trips to Mars, he added, with the relay of a message between Earth and the Red Planet delayed by about 20 minutes, compared with 1.5 seconds between here and the .
"Before you get an answer to your question almost an hour’s gone by, so it’s hard for Mission Control to be involved in a meaningful way helping you with that situation," he said.

"That's going to make a very difficult challenge for the early Mars missions to solve these kinds of delay sort of problems.
"I do believe that we will solve them in time, we’ll contrive a way to do that safely but we can't do it right now."

Travel time is also a major concern, with the quickest journey of two months only possible when Mars is closest to Earth -- when it also happens to be spinning most rapidly, meaning massive amounts of fuel are required to land.

"The best time to go to Mars is when it’s on the opposite side of the Sun to you, as far away as it can get, and that takes the least fuel, but it also takes about seven months one way, which is packing a lot of sandwiches," he said.

"And by the time you get there Earth has moved and it's no longer in a proper position to come back, so you have to wait around for a couple of years until Earth gets in the right position."
Armstrong said Mars was a "worthy challenge" but it was expensive, time-consuming and carried substantial risks not faced in the lunar programme, predominantly to do with radiation.




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Moon Could Solve The Global Energy Crisis




Back to the Moon? Apollo 11. Former Apollo astronaut Harrison Schmitt thinks we should go back to the moon, this time to tap its reserves of helium-3. NASA

Former astronaut, Apollo moonwalker, geologist and former Senator Harrison Schmitt has a modest plan to solve the world’s energy problems. All we need is $15 billion over 15 years and some fusion reactors that have yet to be invented. And we’ll need a moon base.

Schmitt’s idea isn’t novel--he thinks the U.S. should go back to the moon, this time to mine the surface for helium-3, an isotope of helium that is rare on earth but relatively bountiful on the moon. The Russians have been talking about mining helium-3 from the moon for years, but they’ve never put forth a viable plan. Schmitt thinks his, all things considered, is pretty realistic.

So how does Schmitt’s plan break down? We’ll need $5 billion for a helium-3 fusion demonstration plant, because as of right now no such thing exists. We’ll also need to invest $5 billion more in a heavy-lift rocket capable of launching regular moon missions, something akin to the Apollo-era Saturn V.
A moon base for mining the stuff would cost another $2.5 billion, and though Schmitt didn’t really specify in his recent presentation to a petroleum conference, the other $2.5 billion could easily be chalked up to operating costs in an endeavor of this magnitude.

But it could pay for itself while developing critical spaceflight technologies and enabling a mission to Mars. Schmitt says a two-square-kilometer swath of lunar surface mined to a depth of roughly 10 feet would yield about 220 pounds of helium-3. That’s enough to run a 1,000-megawatt reactor for a year, or $140 million in energy based on today’s coal prices. Scale that up to several reactors, and you’ve got a moneymaking operation.

Why go to all this trouble? Helium-3 is abundant on the moon and produces little to no radioactive waste that must be cleaned up and stored. The reaction necessary would burn at a much hotter temperature than other fusion reactions, but the chance of environmental disaster via radioactive spill is virtually nil. Plus we would establish a permanent presence on the moon.
Throw in another $5 billion, and we might even be able to populate said moon base with a clone work force and some soothing, Kevin Spacey-esque AI.



Earth Had Two Moons?

      
Earth may have once had two moons, but one was destroyed in a slow-motion collision that left our current lunar orb lumpier on one side than the other, scientists say.

              Astronomers have long been puzzled by the differences between the side of the moon that always faces Earth—the near side—and the side that always faces away, the far side. The topography of the near side is relatively low and flat, while that of the far side is high and mountainous with a much thicker crust.

              According to a new computer model, this discrepancy can be explained if a smaller "companion moon" collided with our moon's far side early in its history. Such a collision would have left the far side splattered with especially hard rocky material that now forms the current lunar highlands. So could there be taht Earth had two moons?

               
            For the theory to work, the smaller moon must have crashed into the larger one at about 4,400 miles (7,081 kilometers) an hour.
           "This is the slowest possible collision the two massive bodies could have if they fell into each other’s gravity," explained study co-author Erik Asphaug, a planetary scientist at the University of California, Santa Cruz (UCSC).

                 
          At this relatively slow speed, the far-side collision wouldn’t have been energetic enough to melt rock or carve out a crater. But it would have been forceful enough to plaster material from the smaller moon onto the larger moon.
"It's like a car crash, where you have crumpled bumpers but you don't melt the cars as they're colliding," Asphaug said. "This is the same kind of phenomenon." An Earth with two moons!

           Moon Collision Created Meteor Shower
The new theory, by Asphaug and UCSC postdoctoral researcher Martin Jutzi, is detailed in the current issue of the journal Nature. According to their model, the two moons coexisted peacefully for about 80 million years, each in its own stable orbit, so two moons. The moons were the same color and composition, but one was about three times larger than the other, Asphaug said. But still imagine our days the Earth with two moons.. a bit fantasy-like image.

            "Our moon looked like a big dinner plate in the sky ... and when it set, there was this other moon trailing it by about 60 degrees," he said.
             This brief period of lunar harmony was shattered, according to the model, when natural gravitational interactions with Earth caused both moons to drift farther away from our planet. The sun's gravitational tug then destabilized the smaller moon’s orbit and caused it to fall into its larger sibling.
Though not very energetic, the collision would have ejected trillions of tons of lunar debris into space, obscuring both moons for several days.

              "When the dust cleared, you had one moon that might have looked similar to our moon today," Asphaug said. For up to a million years after the event, Earth would have been bombarded by moon bits of various sizes, the biggest of which could have been as much as 62 miles (100 kilometers) across.

               "You'd have meteors raining down all over the sky for a long period of time," Asphaug said, though there probably would have been no life yet on Earth to witness the spectacular sky shows.

                Astronomer Jeffrey Taylor of the University of Hawaii said the new moon theory is very interesting and worth further investigation.
Asphaug and Jutzi's model not only accounts for the moon's asymmetry, Taylor said, but the findings also explain the fates of the smaller, companion satellites that another theory predicts should have formed alongside our moon.

           One of the leading theories for how our moon formed is that it was born after a Mars-size planet crashed into Earth shortly after the solar system's formation about 4.5 billion years ago. (See "Earth-Asteroid Collision Formed Moon Later Than Thought.")


          Scientists think the earlier smashup created a ring of molten rock debris around Earth, which eventually coalesced into several bodies, including our current moon. (Related: "The Moon Has Shrunk, and May Still Be Contracting.")

          But "if that's the case, what happened [to the smaller moons]? This is one thing that could have happened to them," said Taylor, who was not involved in the study.
The new theory isn't without its problems, however. For example, it doesn't explain why the lumpy far side of our moon shows a high concentration of aluminum, Taylor said.

         If the two moons had formed from the same material, as is assumed, the companion moon—and its splatterings—should have been low in aluminum, like our own moon's interior.
However, this problem could be resolved by future lunar studies, Taylor said, and it's not a serious enough reason to dismiss the theory. "If anything," he said, "it just opens up more cool problems to work on."

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