Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- 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
|
