Ptolemy

• Redshift theory: Universe is expanding

• Geocentric theory: Earth centered SS

Copernicus

• Discovered Pluto

• Heliocentric theory: Sun centered SS

Brahe

• 3 laws of planetary motion

• Recorded exact positions of the Earth, moon, and sun

Kepler

• 3 laws of planetary motion

• E=mc^2

Galileo

• Discovered Pluto

• Observe phases of Venus, sunspots, and 4 largest moons of Jupiter

Newton

• Gravity/Inertia: reason planets orbit

• Heliocentric theory: Sun centered SS

Einstein

• Discovered a large belt of icy material around the entire solar system

• E=mc^2

Hubble

• Redshift theory: Universe is expanding

• Geocentric theory: Earth centered SS

Tombaugh

• Discovered a large belt of icy material around the entire solar system

• Discovered Pluto

Kuiper

• Discovered a large belt of icy material around the entire solar system

• Gravity/Inertia: reason planets orbit