Phobos and Deimos are two small, irregularly shaped moons that orbit Mars. They were both discovered by American astronomer Asaph Hall in 1877, and are named after the sons of Ares, the Greek god of war (Mars in Roman mythology).
Phobos is the larger of the two moons, with a diameter of about 22.2 kilometers (13.8 miles), while Deimos is smaller, with a diameter of about 12.4 kilometers (7.7 miles). Both moons are heavily cratered and have a dusty, rocky surface.
Phobos orbits very close to Mars, at a distance of only about 9,378 kilometers (5,827 miles) above the planet's surface. This makes it the closest orbiting moon to any planet in our solar system. It takes Phobos just 7 hours and 39 minutes to complete one orbit around Mars.
Deimos orbits Mars at a distance of about 23,460 kilometers (14,577 miles) and takes about 30 hours to complete one orbit. Both moons have very low surface gravity, which makes them prone to being heavily influenced by the gravitational pull of Mars. In fact, scientists believe that both Phobos and Deimos are captured asteroids that were pulled into orbit around Mars.
The study of Phobos and Deimos is important for understanding the evolution and history of the Martian system. Scientists believe that the moons may contain valuable information about the formation and early history of Mars, as well as clues about the potential for future human exploration and colonization of the planet.
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