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 its closest point to Earth in its orbit, and Hall had one question on his ...

Mars, the fourth planet from the Sun, is a subject of fascination for astronomers. Though significantly smaller than Earth, ...

The ringed planet sports over 60 moons. Mars has just two, Deimos and Phobos. According to NASA, Phobos is on track to be pulled apart within 30 to 50 million years, ...

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part of one — that was gravitationally captured by the Red Planet long ago, a new preprint study based on previously unpublished photos ...

NASA’s Odyssey orbiter captured stunning new infrared images of the bizarre Martian moon Phobos. Scientists have debated the origins of Phobos, and some believe it is either a chunk of Mars that ...

Orbiting 3,700 miles above the surface of Mars, Phobos is closer to its planet than any other moon in the solar system. That is part of the problem. Mars’ gravity is drawing in Phobos by about 6 ...

Efforts to reach the Martian moon Phobos have long been outshined by missions to the red planet itself. Now, scientists in Russia, Canada and the U.S. are preparing their own missions to the ...

However, unlike the moon, Phobos' orbit around Mars is not stable: The tiny satellite is trapped in a death-spiral and is slowly falling towards the Martian surface at a rate of 6 feet (1.8 meters ...

Phobos, which is an oblong, crater-covered moon measuring just 27 kilometers across at its widest point, might be just the right place if we want to learn more about the history of the Red Planet ...

Phobos and Deimos could have formed from asteroid debris, a new study suggests. ... Mars’ moons could be the remains of an ill-starred asteroid that got too close to the Red Planet.