Multiple choice

In 1610, Galileo discovered four moons of which planet?

  1. Neptune

  2. Saturn

  3. Jupiter

  4. Mars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Galileo discovered Jupiter's four largest moons (Io, Europa, Ganymede, and Callisto) in 1610 using his telescope. These are called the Galilean moons. This was a major discovery supporting the Copernican heliocentric model.

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