February 22, 2010
While the Moon is Earth's only known natural satellite, a few small near-Earth asteroids have become temporary Earth satellites.
However, if a massive third body, like the Moon, gravitationally nudged a small object, or if an asteroid-Moon collision ejected an object from the Moon's surface, it could then become a long-term Earth satellite.
In June 2006, Earth captured tiny asteroid 2006 RH120. This space rock became a temporary Earth satellite, sticking around for roughly 1 year.
Photo by Peter Birtwhistle, Great Shefford Observatory
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