Mars' moon Phobos may actually be a comet — or at least part of one — that was gravitationally captured by the Red Planet long ago, a new preprint study based on previously unpublished photos ...

On a flyby of Mars, the European Space Agency (ESA) captured a rare photo of its second moon - but what do we know about it? It's called Deimos, and is much smaller and more mysterious than Phobos ...

Phobos is larger, at 13.9 miles wide, whereas Deimos is just 7.5 miles in diameter and the former is closer to Mars than its smaller twin. Earth's moon has a diameter of 2,158 miles — 155 times ...

A mission to survey the results of a deliberate crash between an asteroid and a NASA spacecraft has taken stunning images of ...

Billions of years ago, the fourth planet from the sun could have been mistaken for Earth’s smaller twin ... suggests Mars got its two faces because an object the size of Earth’s moon slammed ...

Like our moon, Deimos is tidally locked to Mars, meaning the same side always faces the planet—the only side visible to rovers on the Martian surface. The only way to see Deimos’ far side up ...

some tribes called it the full hunger moon. Earth is catching up to Mars in the orbital race, which means the Red Planet is getting bigger and brighter. On Feb. 1, it rises in the east about three ...

Europe's Hera spacecraft flew by Mars this week on its way to catch up with an asteroid and tested out its cameras on the Red Planet's tiniest moon. The European Space Agency's Hera mission was ...