Final answer:
Mars has two moons, Phobos and Deimos, which are likely captured asteroids and were discovered in 1877 by Asaph Hall.
Step-by-step explanation:
Mars has two small moons, named Phobos and Deimos. These moons were discovered in 1877 by the American astronomer Asaph Hall. Phobos and Deimos are believed to be captured asteroids, due to their composition which is similar to many asteroids found in the outer asteroid belt. They are also irregularly shaped and heavily cratered, with Phobos being the larger of the two with dimensions of approximately 26 kilometers, and Deimos being smaller at about 16 kilometers in size.