Aristotle
one of the most famous philosophers of all time
argued for a spherical shape to the earth
argued for a geocentric model of the universe
Aristarchus
first known person to propose the heliocentric model
Ptolemy
Greek astronomer
created a catalogue of 48 constellations
followed a geocentric model
Copernicus
resurrected the idea of a sun-centered model in the Middle Ages
Kepler
discovered the three laws of planetary motion
Galileo
one of the first to use a telescope
discovered the four largest moons of Jupiter