Were the Mars moons Phobos and Deimos born from another shattered moon?

The moons of Mars, Phobos and Deimos, might have both arose from the remains of a larger moon that once orbited the Red Planet, a new study finds.

The origins of Phobos and Deimos remain uncertain. While their misshapen forms and their cratered surfaces suggested they were asteroids captured by the gravitational pull of Mars, previous research questioned this scenario because of the moons’ near-circular orbits around the Red Planet’s equator. If these moons really were captured asteroids, computer simulations found that they’dlikely have more irregular orbits.

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