NASA / VRS / SCIENCE PHOTO LIBRARY NASA / VRS / SCIENCE PHOTO LIBRARY
Moon craters. Apollo 11 spacecraft view of a large meteorite impact crater on the far side of the Moon. The crater, named IAU No. This crater is millions of years old, as newer, smaller craters have formed in and around it due to later impacts. The Moon acts as a kind of natural shield, sheltering the Earth from some of the objects that might otherwise hit it; some lunar impact basins are several hundred km across. The Earth has also suffered from heavy bombardments, but weathering and geological processes have destroyed most of the evidence. Meteorites are lumps of metal and rock formed from the remnants of asteroids and comet cores.
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