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 ...

Forbes contributors publish independent expert analyses and insights. I cover aerospace, astronomy & hosted The Cosmic Controversy Podcast. Mars' mysterious moons of Deimos and Phobos have long ...

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Curious about how many moons Mars has? Discover fun facts about Phobos and Deimos — Mars' two tiny moons — including their origins, orbits, and a surprising future prediction. Mars has two moons — ...

A European spacecraft on a journey to study NASA's asteroid crash site did a quick pop-in of Mars on its way, capturing unprecedented images of Mars' lesser-known moon, Deimos. Mars has two moons, ...

NASA's Europa Clipper spacecraft is on a journey to Jupiter's moon, Europa, a frozen world believed to harbor a salty ocean beneath its icy crust — and possibly the conditions to support life. Credit: ...

It's possible that Mars' moons were originally asteroids that were captured by the planet's gravitational pull. There's also a theory that the two moons were created after a large object collided with ...