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  1. en.wikipedia.org › wiki › Moons_of_MarsMoons of Mars - Wikipedia

    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.

    • Mars

      A 2023 study shows evidence, based on the orbital...

    • Phobos (moon)

      Phobos (/ ˈ f oʊ b ə s /; systematic designation: Mars I) is...

  2. science.nasa.gov › mars › factsMars: Facts - NASA Science

    Moons. Rings. Formation. Structure. Surface. Atmosphere. Magnetosphere. Introduction. Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape.

  3. science.nasa.gov › mars › moonsPhobos - NASA Science

    Mars Moons. Phobos is the larger of Mars' two moons. It orbits Mars three times a day, and is so close to the planet's surface that in some locations on Mars it cannot always be seen. Quick Facts. Phobos is Mars' largest moon. The largest feature on Phobos is Stickney crater. About Phobos.

  4. science.nasa.gov › mars › moonsMars Moons - NASA Science

    Mars Moons. Moons of Mars. 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. Phobos is the larger of Mars' two moons. It orbits Mars three times a day, and is so close to the planet's surface that in some locations on Mars it cannot always be seen.

  5. solarsystem.nasa.gov › planets › marsIn Depth | Mars – NASA Solar System Exploration

    The moons get their names from the horses that pulled the chariot of the Greek god of war, Ares. Phobos, the innermost and larger moon, is heavily cratered, with deep grooves on its surface. It is slowly moving towards Mars and will crash into the planet or break apart in about 50 million years.