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Galileo Galilei was an ancient astronomer who died at 77 years old. He is most known for his discovery of the Galilean Satellites, the four largest moons of Jupiter, but he also found that, like our Moon, Venus also has phases.

Galileo also discovered Saturn's rings. At the time, he thought these rings where 2 of Saturn's moons.


  • The spacecraft Galileo is named his honor.
  • He was the first person to find moons orbiting another planet.
  • Galileo tracked the movement of Neptune before it was discovered, but it is unknown if he knew it was a planet or not.
  • Galileo helped improve the telescope.