Mars once had many moons

Phobos, Deimos all that’s left of larger family formed in wake of asteroid impact, simulation suggests

Martian moons

MANY MOONS AGO  Mars’ moons, Deimos (left) and Phobos (right), might have formed out of rocks blasted off the Red Planet by a large asteroid, a new study suggests.

Deimos: JPL-Caltech/NASA, U. Arizona; Phobos: ESA, DLR, FU Berlin, CC-BY-SA IGO 3.0

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