Study Backs Theory That Impact Formed Martian Moons

Credit: Phobos: American Geophysical Union
HOUSTON—The origin of the Martian moons Phobos and Deimos has been long debated. Were they created by faraway asteroids nabbed by Martian gravity? Or from objects accreted from the debris thrown outward by a large impact with the Martian surface? A new look, using data gathered by NASA’s Mars Global...

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