The long, shallow grooves lining the surface of Phobos are likely early signs of the structural failure that will ultimately destroy this moon of Mars.
Mars may one day have rings like Saturn’s, if the Red Planet manages to completely crush its innermost moon, Phobos.
More than 80% of the world’s population lives under light-polluted skies, a study suggests.
The moon’s orbit brings it 6 feet closer to the red planet every century. Facts about the Martian moons Phobos and Deimos.
Ask an Astronomer is run by volunteers in the Astronomy Department at Cornell University. We answer your astronomy questions. Please browse our archive first.