![]() ![]() In 1614, German astronomer Simon Marius claimed in his book Mundus Jovialis ( “The World of Jupiter”) to have discovered the moons independently and simultaneously. His observations were published in March of 1610 in his treatise Sidereus Nuncius (“ Starry Messenger”). However, on the following day, they were seen for the first time as separate bodies. At the time, he was unable to distinguish between it and Europa due to the low power of his telescope, so the two were recorded as a single point of light. Like all the Galilean Moons, it discovered by Galileo Galilei in January of 1610 using a telescope of his own design. It is also one of only four known bodies that experiences active volcanism and – with over 400 active volcanoes – it is the most geologically active body in the Solar System. Known as the Galilean Moons, in honor of their founder, these moons possess enough natural wonders to keep scientists busy for centuries.Īs Jupiter’s innermost moon, it is also the fourth-largest moon in the Solar System, has the highest density of any known moon, and is the driest known object in the Solar System. And this is certainly the case when it comes to Jupiter’s system of moons, particularly its four largest – Io, Europa, Ganymede and Callisto. With every layer removed, one finds fresh mysteries to ponder over, each one more confounding than the last. Exploring the Solar System is like peeling an onion.
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