Small Moon Deimos

Posted on September 8, 2024  •  1 minutes  • 141 words

图文来源自：nasa. copyright: HiRISE

Mars has two tiny moons, Phobos and ,named for the figures in Greek mythology Fear and Panic.Detailed surface views of smaller moon Deimos are shownin both these panels.The,by the HiRISE camera on board the spacecraft, NASA’s long-livedsatellite.The outermost of the two Martian moons,Deimos is one of the smallest known moons in the Solar System, measuring only about 15 kilometers across. Both Martian moons were discovered in 1877 by , an American astronomer working at the US Naval Observatory in Washington D.C.But their existence was postulated around 1610 by , the astronomer who derived the laws of planetary motion.In this case, Kepler’s predictionwas not based on scientific principles, buthis writings and ideas were so influential that the two Martian moonsare discussed in works of fiction such as ’s Gulliver’s Travels, written in 1726, over 150 years before their discovery.