A | B |
nebula | gas and dust |
protostar | forms from nebula |
heliocentric | sun is center of solar system |
geocentric | earth is center of solar system |
Kepler | discovers elliptical orbits |
Copernicus | heliocentric view of solar system |
Ptolemy | geocentric view of universe |
refracting telescope | uses mirrors to gather light |
spiral galaxy | shaped like a pinwheel |
elliptical galaxy | shaped like a flattened oval |
Big Bang Theory | explains origin of universe |
classifiction of stars | temperature, brightness, and size |
corona | outermost layer of sun |
nuclear fusion | produces energy in sun and other stars |
hydrogen | element makes up 60% of stars |
black hole | follows supernova of giant star |
white dwarf | follows nova of medium sized star |
protostar | early stage of star, formed from nebula |
Hertzsprung-Russell diagram | compares temperature and brightness of stars |
refracting telescope | uses lenses to gather visible light |