Rocks from space fall to Earth all the time. Meteorite fragments are so common that they turn up in jewelry. Some of these fragments have been found to come from the Moon and Mars, giving us a very cheap form of sample retrieval. They're blown off the surface of these worlds when a large object impacts the surface, creating a massive explosion.
http://www.spacedaily.com/reports/Earth_Rocks_In_Space_999.html
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