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13 Cards in this Set

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