One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at ...

Another hypothesis is that Phobos and Deimos formed very much like Earth's moon did — that an impact on the surface of Mars threw debris into orbit that eventually coalesced into the two moons ...

While on a flyby of Mars, Hera was able to use three of its imaging instruments to capture images of Deimos, the smaller of Mars' two moons, the ESA said. Deimos is about 15,000 miles from Mars.

The two moons of Mars, Phobos and Deimos, were discovered in 1877 by the American astronomer Asaph Hall using the 26-inch refractor telescope at the U.S. Naval Observatory in Washington D.C.

Mars has two irregularly shaped moons, and neither is mighty. Phobos, the larger of the two, is about 17 miles in diameter at its widest, and orbits closer to the red planet at an altitude of ...

NASA’s Perseverance rover, which has been exploring Mars since arriving there in dramatic fashion in 2021, has just shared an exquisite image of Deimos, one of the red planet’s two moons ...

Of Mars’s two moons, Phobos is slightly larger. Both are irregularly shaped, like potatoes. Phobos is about 27 km across on its longest side, and Deimos is 15 km across.

The two small moons of Mars, Phobos (about 22km in diameter) and Deimos (about 13km in diameter), have puzzled scientists for decades, with their origin remaining a matter of debate.

Each month, a full moon lights up the night sky—but this July brings a special sight for stargazers. The full Buck Moon will ...

Mars' moons are not easy to explain. Both are small — Phobos is 16 miles (26km) across at its widest point, Deimos is just 10 miles (16km) — and lumpy, which makes them look like captured ...

While on a flyby of Mars, Hera was able to use three of its imaging instruments to capture images of Deimos, the smaller of Mars' two moons, the ESA said. Deimos is about 15,000 miles from Mars.

Mars' moons are not easy to explain. Both are small — Phobos is 16 miles (26km) across at its widest point, Deimos is just 10 miles (16km) — and lumpy, which makes them look like captured ...