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Earth may once have had more than one moon, most probably two more, NASA scientists think.
Lissauer and Chambers figure the two small moons would have orbited Earth for about 100 million years before the slight gravitational tugs from the solar system's other planets sent them spiraling off course, either to crash into the Moon or Earth or to drift off into space.
GEORGIA, USA: In its youth our Moon may have once been bracketed by two asteroidal companions, says a new study. From Earth, these tiny moons – up to 100 km wide – would have appeared as two extremely bright stars.