Solar System
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who is Nicolaus Copernicus? What did he do for astronomy?
• mid 1500s - heliocentric model
who is claudius ptolemy? what did he do for astronomy?
• greek astronemer • wrote a 13 volume book (Almagest) • geocentric model • accepted for 1400 years
who is tycho brahe? what did he contribute to astronomy?
• late 1500s (record data) • sun and moon went around earth • while other planets revolved around the sun • took the most accurate data measurements and observation to this point • geocentric model
who is johannes kepler? what did he contribute to astronomy?
• brahes assistant • brahe and kepler didnt get along • 3 laws of planetary motion • early 1600s : all plantes revolve around sun in an elliptical orbit • didnt believe what brahe said, he believes the heliocentric model
who is galileo galilei? what did he contribute to astronomy?
• 1609; he uses a telescope • crators on the earth’s moon, 4 of jupiters moon, sunspots on the sun and phases of venus • not wandering stars ➡ actual path
who is isaac newton? what did he contribute to astronomy?
• 1687; discovered gravity • F= M[1] M[2]/ d[2] • all planets revolve around the sun ➡ heliocentric (most massive object in solar system)
who is edwin hubble? what did he contribute to astronomy?
• proved other galaxies beyond milky way (1924) - confirmed that the universe is much larger than our galaxy