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The Galilean moons are named after Galileo Galilei, who observed them in either December 1609 or January 1610, and recognized them as satellites of Jupiter in March 1610; [2] they remained the only known moons of Jupiter until the discovery of the fifth largest moon of Jupiter Amalthea in 1892. [3]
A montage of Jupiter and its four largest moons (distance and sizes not to scale) There are 95 moons of Jupiter with confirmed orbits as of 5 February 2024. [1] [note 1] This number does not include a number of meter-sized moonlets thought to be shed from the inner moons, nor hundreds of possible kilometer-sized outer irregular moons that were only briefly captured by telescopes. [4]
Io (/ ˈ aɪ. oʊ /), or Jupiter I, is the innermost and second-smallest of the four Galilean moons of the planet Jupiter.Slightly larger than Earth's moon, Io is the fourth-largest moon in the Solar System, has the highest density of any moon, the strongest surface gravity of any moon, and the lowest amount of water by atomic ratio of any known astronomical object in the Solar System.
Europa was discovered in 1610 by the Italian astronomer Galileo Galilei. The icy body is the fourth-largest of Jupiter’s 95 known moons. ... Voyager 2 and Galileo missions — but this will be ...
Europa, along with Jupiter's three other large moons, Io, Ganymede, and Callisto, was discovered by Galileo Galilei on 8 January 1610, [2] and possibly independently by Simon Marius. On 7 January, Galileo had observed Io and Europa together using a 20×-magnification refracting telescope at the University of Padua , but the low resolution could ...
It's easy for Hubble to take pictures of Jupiter or its moons, but it only gets the chance to capture the planet on cam with three visible Galilean satellites once or twice a decade. That's what ...
In the 1960s the moon's effect on Jupiter's magnetic field was discovered. [1] The flybys of the two Pioneer probes, Pioneer 10 and 11 in 1973 and 1974, provided the first accurate measurement of Io's mass and size. Data from the Pioneers also revealed an intense belt of radiation near Io and suggested the presence of an atmosphere. [1]
A view of Jupiter's moon Europa created from images taken by NASA's Galileo spacecraft in the late 1990's. Six spacecraft have visited Europa since it became one of the first moons found beyond Earth.