Explanation: Mars has two tiny moons, Phobos and Deimos. Pictured above is Deimos, the smaller moon of Mars. In fact, Deimos is one of the smallest known moons in the Solar System measuring only nine miles across. The diminutive Martian moons were discovered in 1877 by Asaph Hall, an American astronomer working at the US Naval Observatory in Washington D.C. The existence of two Martian moons was predicted around 1610 by Johannes Kepler, the astronomer who derived the laws of planetary motion. In this case, Kepler's prediction was not based on scientific principles, but his writings and ideas were so influential that the two Martian moons are discussed in works of fiction such as Jonathan Swift's Gulliver's Travels, written in 1726, over 150 years before their actual discovery.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: deimos - Mars - Deimos - Mars Publikacii so slovami: deimos - Mars - Deimos - Mars
Sm. takzhe: Volch'ya Luna zakryvaet Mars Ledyanye oblaka nad Krasnoi planetoi Dolina Marinera: Bol'shoi kan'on na Marse Mars: sputnik, kratery i vulkany Malen'kii sputnik Deimos Dvizhenie Marsa Leopardovye pyatna na marsianskih kamnyah Vse publikacii na tu zhe temu >>