Historical Astronomers

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Three laws of planetary motion

His data was used by Kepler

Proved that galaxies exist beyond the Milky Way

Believe the Moon and the Sun revolved around the Earth, and the rest of the planets revolved around the Sun

Discovered four of Jupiter's moons

First to use a telescope as a scientific instrament

Discovered the planets had elliptical orbits

Showed that gravity keeps the planets in orbit