The moons of Mars may have started with a huge collision with a protoplanet one third the mass of Mars that formed a ring around Mars. The inner part of the ring formed a large moon. Gravitational interactions between this moon and the outer ring formed Phobos and Deimos.

2024年11月5日 · Mars has two moons, Phobos and Deimos. Both are thought to be captured asteroids, or debris from early in the formation of our solar system.

2017年12月8日 · Of the four rocky, terrestrial planets, only Mars has more than one moon. The two small bodies that orbit the red planet are both smaller than Earth's moon, and raise a number of questions...

Phobos (/ ˈ f oʊ b ə s /; systematic designation: Mars I) is the innermost and larger of the two natural satellites of Mars, the other being Deimos. The two moons were discovered in 1877 by American astronomer Asaph Hall. Phobos is named after the Greek god of fear and panic, who is the son of Ares (Mars) and twin brother of Deimos.

2022年8月15日 · Mars has two known Moons — Phobos and Deimos, designated as Mars I and Mars II, respectively. They’re both very small: Phobos has a radius of 11.2 km (6.9 miles), and Deimos — only 6.2 km (3.8 miles).

2013年8月27日 · Mars is kept company by two cratered moons—an inner moon named Phobos and an outer moon named Deimos. On August 1, 2013, NASA’s Curiosity rover pointed its telephoto lens toward the Martian heavens and recorded a series of night sky images that show the irregularly shaped moons crossing paths.

2024年11月20日 · A NASA study using a series of supercomputer simulations reveals a potential new solution to a longstanding Martian mystery: How did Mars get its moons? The first step, the findings say, may have involved the destruction of an asteroid.