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Explanation: This moon is doomed. Mars, the red planet named for the Roman god of war, has two tiny moons, Phobos and Deimos, whose names are derived from the Greek for Fear and Panic. These Martian moons may well be captured asteroids originating in the main asteroid belt between Mars and Jupiter or perhaps from even more distant reaches of our Solar System. The larger moon, Phobos, is indeed seen to be a cratered, asteroid-like object in this stunning color image from the robotic Mars Reconnaissance Orbiter, which can image objects as small as 10 meters. But Phobos orbits so close to Mars - about 5,800 kilometers above the surface compared to 400,000 kilometers for our Moon - that gravitational tidal forces are dragging it down. In perhaps 50 million years, Phobos is expected to disintegrate into a ring of debris.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Mars - Phobos
Publications with words: Mars - Phobos
See also:
- APOD: 2025 September 28 Á Leopard Spots on Martian Rocks
- APOD: 2025 July 15 Á Collapse in Hebes Chasma on Mars
- APOD: 2025 July 6 Á The Spiral North Pole of Mars
- APOD: 2025 June 29 Á Dark Sand Cascades on Mars
- APOD: 2025 June 22 Á A Berry Bowl of Martian Spherules
- APOD: 2025 June 15 Á Two Worlds One Sun
- Perseverance Selfie with Ingenuity