Mars' Two Speedy Moons

Mars' two moons, Phobos and Deimos, are small, irregularly shaped bodies that orbit unusually close to the planet. Their capture origin is the leading theory, yet their precise composition and how they were captured remain unexplained. Their rapid orbits—Phobos circles Mars in just 7.6 hours—and their strange, dark surfaces continue to puzzle scientists, making them among the most enigmatic moons in the solar system.