What is Phobos?
Q: What is Phobos?
A: Phobos is one of Mars' moons.
Q: What is the other moon of Mars?
A: The other moon of Mars is Deimos.
Q: What is the size of Phobos?
A: Phobos is only 27 kilometers in diameter.
Q: What is Phobos named after?
A: Phobos is named after the god Phobos in Greek mythology, and its name means "fear".
Q: What is happening to Phobos' orbit?
A: Phobos is trapped in tidal drag, and its orbit is lowering roughly 1.8 meters per century.
Q: What is likely to happen to Phobos in about 50 million years?
A: Phobos will reach the Roche limit, where it is likely to be torn apart. Some fragments will fall on Mars and some will form a planetary ring or rings around Mars.
Q: What is Deimos?
A: Deimos is the smaller of the two moons of Mars.
