Galileo Galilei first observed the four largest moons of Jupiter on
07 January 1610. These moons are now known as the Galilean moons, and
they are named Io, Europa, Ganymede, and Callisto. Galileo's
observations of these moons were made using a telescope he had designed,
and this discovery was significant in supporting the heliocentric model
of the solar system proposed by Copernicus. The observation of these
moons provided evidence that not all celestial bodies orbited the Earth,
challenging the geocentric model that was widely accepted at the time.
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