LYCOS RETRIEVER 
Asteroids: Moons
built 208 days ago
The process will release gases deposited on the moon's surface during billions of years of exposure to the solar wind and bombardment by asteroids and comets. Hydrogen is used to draw oxygen out of iron oxides in the regolith to form water. The water then can be electrolyzed to split it back into pure hydrogen and oxygen, a process tested earlier this year by engineers at NASA's Johnson Space Center in Houston.
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More than 200 asteroids have been identified that regularly intersect the orbit of the earth, and over geologic time asteroids in similar orbits have struck the earth. Hermes, discovered in 1937 and subsequently lost until 2003 when it was identified as a pair of asteroids, comes within 378,000 mi (608,000 km), and Eros comes within 14 million mi (22 million km). More recently, a small asteroid provisionally designated 2002 MN, 150–360 ft (45–110 m) in diameter, passed within 75,000 mi (121,000 km) of the earth—about a third of the distance to the moon—in 2002. Astronomers have observed about several hundred small asteroids, most measuring less than 55 yd (50 m) across, in near-earth orbits that are spread thinly between the earth and Mars. Many of these small asteroids have orbits that intersect the earth's.
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One of the most surprising features of asteroids is that several have been observed to have moons of their own. The first asteroid to be observed with a moon was 243 Ida (58 x 23 km); it's moon is called Dactyl, and measures approximately 0.75 x 0.87 x 1.0 miles. It is now estimated that between 10-30% of asteroids have moons.
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