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Apparent sizes of the moons of Mars, Deimos and Phobos, and the Moon as viewed from the surface of their respective planets (Mars' moons imaged by the Curiosity rover, 1 August 2013) Size comparison between Phobos, Deimos and the Moon (right) If viewed from Mars's surface near its equator, a full Phobos would look about one-third as big as a ...
It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large ... the moons of Jupiter and ... Mars: 3 389.5 ...
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.
Mars’s moons don’t get much credit. But they’re small, lifeless, and weird little things. Here’s everything you should know about them.
Deimos (/ ˈ d aɪ m ə s /; systematic designation: Mars II) [11] is the smaller and outer of the two natural satellites of Mars, the other being Phobos. Deimos has a mean radius of 6.2 km (3.9 mi) and takes 30.3 hours to orbit Mars. [5] Deimos is 23,460 km (14,580 mi) from Mars, much farther than Mars's other moon, Phobos. [12]
Mars may have had a single moon before something smashed into it, tearing it asunder into the two moons we see today. In a study published Monday in Nature, scientists explained how they used the ...
(Pluto has four smaller moons besides Charon.) For example, Mars is orbited by two tiny potato-shaped moons called Phobos and Deimos, which are likely two asteroids that were captured by the red ...
Triton is large enough to have achieved hydrostatic equilibrium, but, uniquely for a large moon, has a retrograde orbit, suggesting it was a dwarf planet that was captured. Neptune also has seven known inner regular satellites, and eight outer irregular satellites. Pluto, a dwarf planet, has five moons.