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13 Cards in this Set
- Front
- Back
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What is the Cosmology?
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study of structure of universe
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Which way do the stars rotate around celestial pole?
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counterclockwise
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Sun rises and sets in _____
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zodiac
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Planets normally move west to east, but may more backwards in ____ motion.
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retrograde
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Who modified system and put sun at center?
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Copernicus
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Who made Earth center and explained retrograde motion?
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Brahe
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Who found orbits to be ellipses?
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Kepler
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What is the distance light travels in a year? (term)
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Light-year
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What is the term describing distance from Earth to Sun?
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Astronomical unit
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What is the distance between crests of a wave?
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wavelength
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What is describing the number of crests in one second? (hint hint hint time: unit is hertz)
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Frequency
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what are photons?
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energy in discrete packets
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X-ray astronomy studies 0.1 nm to 10nm, from _____, _____, _____, _____.
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corona, solar flares, pulsars, black holes
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