Mars has two very small satellites orbiting it, Phobos and Deimos. Scientists believe that both moons are actually asteroids captured via Mars's gravitational field. Made of dark rock that includes a great deal of carbon, both satellites have many craters due to collisions with debris.Continue Reading
Phobos, with a 13-mile radius, is the larger of the two moons, and it is 5,830 miles from Mars. It circles Mars three times per day. Deimos has a radius of eight miles, and it is 14,580 miles from Mars. It circles Mars once very 30 hours.
Asaph Hall discovered both moons in 1877. He named them after the sons of the Greek god Ares whose Roman counterpart is Mars.Learn more about Planets
The Phobos monolith is a large, upright boulder on Mars's moon Phobos that was first imaged by the Mars Global Surveyor mission in 1998. It is 279 feet across and towers over the surrounding plain.Full Answer >
The two moons of Mars, Deimos and Phobos, are dark and feature numerous craters. They are covered with dust and rocks and show evidence of landslides.Full Answer >
Because Mars with its famous red coloration is readily visible from Earth, it is unknown who first discovered it; NASA lists the planet as "known by the ancients." There are records of its existence as far back as ancient Egypt.Full Answer >
How much people weigh on Mars varies according to how much they weigh on Earth. Someone who weighs 160 pounds on Earth would weigh 59.5 pounds on Mars, according to the Athena Mars Exploration Rovers page hosted by Cornell University.Full Answer >