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Perhaps inspired by Kepler (and quoting Kepler's third law of planetary motion), Jonathan Swift's satire Gulliver's Travels (1726) refers to two moons in Part 3, Chapter 3 (the "Voyage to Laputa"), in which Laputa's astronomers are described as having discovered two satellites of Mars orbiting at distances of 3 and 5 Martian diameters with ...
Mars has two known moons, Phobos and Deimos ("fear" and "dread", after attendants of Ares, the Greek god of war, equivalent to the Roman Mars). Searches for more satellites have been unsuccessful, putting the maximum radius of any other satellites at 90 m (100 yd). [4] Jupiter has 95 moons with known orbits; 72 of them have received permanent ...
Phobos has dimensions of 26 by 23 by 18 kilometres (16 mi × 14 mi × 11 mi), [7] and retains too little mass to be rounded under its own gravity. Phobos does not have an atmosphere due to its low mass and low gravity. [19] It is one of the least reflective bodies in the Solar System, with an albedo of about 0.071. [20]
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 ...
For example, if a TNO is incorrectly assumed to have a mass of 3.59 × 10 20 kg based on a radius of 350 km with a density of 2 g/cm 3 but is later discovered to have a radius of only 175 km with a density of 0.5 g/cm 3, its true mass would be only 1.12 × 10 19 kg.
The good news is, you don’t have to have a telescope to enjoy Mars at opposition! Just look up into the sky after sunset, and Mars will be there. It will be hard to miss!