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Jupiter's moons

Jupiter has 63 known natural satellites.

Although claims are made for the observation of one of Jupiter's moons by Chinese astronomer Gan De in 364 BC, the first certain observations of Jupiter's satellites are those of Galileo Galilei in 1610, who sighted the four large Galilean moons with his 33x telescope.

Note:   The above text is excerpted from the Wikipedia article "Jupiter's moons", which has been released under the GNU Free Documentation License.
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