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Every Space Fact EverWow
Measured fact

Moons

Jupiter has four big moons that Galileo watched move.

How we know

He drew them night after night as they shifted around Jupiter.

More to know

Those moons are Io, Europa, Ganymede, and Callisto.

Galileo GalileiHe used a telescope to study the Moon and Jupiter's moons.Twenty wild facts
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