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Stars, Galaxies, and Universe

AB
nebulagas and dust
protostarforms from nebula
heliocentricsun is center of solar system
geocentricearth is center of solar system
Keplerdiscovers elliptical orbits
Copernicusheliocentric view of solar system
Ptolemygeocentric view of universe
refracting telescopeuses mirrors to gather light
spiral galaxyshaped like a pinwheel
elliptical galaxyshaped like a flattened oval
Big Bang Theoryexplains origin of universe
classifiction of starstemperature, brightness, and size
coronaoutermost layer of sun
nuclear fusionproduces energy in sun and other stars
hydrogenelement makes up 60% of stars
black holefollows supernova of giant star
white dwarffollows nova of medium sized star
protostarearly stage of star, formed from nebula
Hertzsprung-Russell diagramcompares temperature and brightness of stars
refracting telescopeuses lenses to gather visible light



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