In a new study featured by New Scientist, researchers propose that Mars might have once had a much larger moon than it does ...

There are two small moons in orbit around Mars today, but both may be remnants of a much larger moon that had enough of a ...

Mars looks quiet today, but new research suggests the planet’s surface still carries the rhythm of a vanished companion.

Regular, alternating layers in Gale Crater may have been deposited as the result of tides raised by a moon at least 18 times the mass of Phobos, a study says.

One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at its closest point to Earth in its orbit, and Hall had one question on his ...

Mars is probably smaller than you think. It's just half the size of Earth, with barely a third of its mass. Even the Martian moons Phobos and Deimos are petite, measuring just a few kilometers in ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Martian moon Deimos appears dark, framed by the brighter ...

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