"Earthrise" seen by the Apollo 8 astronauts in December 1968. CREDIT: NASA.
Earth Usually Has More Than One Moon, Study Suggests -- Space.com
Earth usually has more than one moon at any given time, according to the results of a new computer simulation.
The huge, bright and iconic moon so beloved by poets and romantics is joined by a rotating cast of captured asteroids that often measure just a few feet across. These mini-moons typically orbit Earth for less than a year before zipping back off into space, researchers said.
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