Ptolemy Tycho Brahe Copernicus Johannes Kepler

Galileo Edwin Hubble Isaac Newton

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Ptolemy TychoBrahe

Copernicus Johannes Kepler

Galileo Edwin Hubble

IsaacNewton

Earth is at the center of the universe

Other planets and the sun revolve around the Earth

Sun and moon revolve around the Earth (Earth-centered)

Other planets revolve around sun while sun revolves around Earth

Believed in a Sun centered universe

Believed all planets orbit the Sun

Believed all planets revolve around the Sun in elliptical orbits

3 laws of planetary motion

Used a telescope to observe objects in space

Other galaxies exist beyond the edge of the Milky Way.

The universe is larger than our galaxy!

The Laws of Gravity

All the planets orbit the most massive object in the solar system