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12 Cards in this Set

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Where did astronomy get its start?
ancient Greece (Greeks)
planet
solid or partly solid world that revolves around a star
solar system
star and its planets, moons and comets
What determines star's temperature?
color;

blue=hot
yellow=medium
red=cool
star
hot ball of gas that creates hot ball of gas that creates its own light



3 basic types of galaxies
irregular, elliptical, spiral
star's relative brightness
apparent magnitude
Milky Way
Earth's galaxy; located in Orion's arm
nebula
cloud deep in space made of hydrogen gas
two ways to measure star distance
light, parsec
Do stars twinkle?
No; they just appear to twinkle because their beams are jostled as they enter Earth's atmosphere.
sunspot
dark regions on the sun's photosphere