In a first, ESA\'s Mars Express orbiter imaged the Martian moons Phobos and Deimos together on Nov. 5, 2009. Phobos, the larger of the two moons, orbits closer to Mars, circling the planet every 7 hou ...

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

The origin of Phobos and Deimos, the two Martian moons, has been a mystery to astronomers. These two bodies are a fraction of the size and mass of the Moon, measuring just 22.7 km (14 mi) and 12.6 ...

Of the two moons, Phobos is larger and closer to Mars; it is 17 miles across and orbits the Red Planet three times a day. Deimos is 9 miles across and takes 30 hours to make a revolution.

Phobos and Deimos, the moons of Mars, are seen by the Mars Odyssey orbiter in 2018. A new study suggests the moons are leftovers from a larger, shattered Martian moon.

These days, our neighbor Mars has just two moons: Phobos and Deimos. But according to a study published Monday in the journal Nature Geoscience, these little satellites may actually be the planet ...

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.

For Mars, Phobos and Deimos, the first two factors are easy to calculate, but the third is a relative unknown as no samples have ever been obtained of the Martian moons.

The red planet Mars, fourth from Earth's sun, has two little moons: Phobos and Deimos.Neither is anything like Earth's moon: small and irregularly shaped, astronomers have long believed that they ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

Mini moon: two views of the Martian moon Deimos taken by NASA’s Mars Reconnaissance Orbiter. (Courtesy: NASA) A new theory for the mysterious origins of Mars’ two tiny moons Phobos and Deimos has been ...

Phobos is 22 kilometers (14 miles) across and Deimos a bit more than half of that. The work suggests that between 1 and 2.7 billion years ago, there was a single moon orbiting the Red Planet.