Early Thinkers-pat and mark

nicholas copernicus

Feb 19, 1473

heliocentric model

tycho brahe

Dec 14, 1546

tychoes lunar theory

galileo galilie

Feb 15, 1564

phases of venus

johannes kepler

Dec 27, 1571

laws of planetary motion

giovanni cassini

Jan 8, 1625

found 4 of saturens moons

sir isaac newton

Jan 4, 1643

law of gravity

edmon haley

Nov 8, 1656

irst astrologer to calculate the orbit of haleys comet

charles messier

Jun 26, 1730

discovered

william herschel

Nov 15, 1738

sidereal astronomy

anne jump cannon

Dec 11, 1863

contemperary steller clasifcation

albert einstein

Mar 14, 1879

theory of relativety

edwin hubble

Nov 28, 1889

hubble telescope

frank drake

May 28, 1930

search for extrateraterrestrial intelligence

carl sagan

Nov 9, 1934

published over 600 scientific writing

stephen hawking

Jan 8, 1992

black holes big bens universe