LHHS OCAD Astronomy
Terms
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- 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