Mars once had many moons
Phobos, Deimos all that’s left of larger family formed in wake of asteroid impact, simulation suggests
![Martian moons](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/07/063016_cc-mars-moons_free.jpg?fit=860%2C460&ssl=1)
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