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January 14, 2013 - Simon Says

14 Jan 2013, 05:00 UTC
January 14, 2013 - Simon Says
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The Week in SpaceJanuary 14-20, 2013 Simon Says In 1610, when Galileo first observed the four largest moons of Jupiter, he announced their discovery in his book Sidereus Nuncius (The Starry Messenger). In that book, he referred to them as the “Medician Stars” in honor of the family of Cosimo de’ Medici, the Grand Duke of Tuscany. About four years later, Simon Marius, a German astronomer born 440 years ago this week, suggested naming them after lovers of Zeus (the Greek equivalent of Jupiter). Since this was more than three centuries before the International Astronomical Union became the official arbiter of planet and satellite nomenclature, popular consensus carried much weight in these matters and Marius’s names stuck. Today we know these moons individually as (clockwise from top left) Io, Callisto, Europa, and Ganymede. Image credit: NASA / JPL / DLR Weekly CalendarJanuary 14-20, 2013 Holidays - Sky Events - Space History Monday 14Neptune 6° south of Moon 1975: Earth Resources Technology Satellite is renamed Landsat2005: Huygens probe lands on Titan2008: MESSENGER spacecraft makes its first flyby of Mercury Tuesday 151973: Luna 21 lander and Lunokhod 2 rover land on Moon1976: Helios 2 launched2006: Stardust spacecraft returns samples of comet dust ...

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