Across
- 6. Residual radiation from the first light released by the Big Bang
- 7. an apparent wavelength increase due to an object moving further away
- 10. an objects resistance to change in velocity. Helps keep the Earth in orbit
- 11. this model suggests a sun centered solar system
- 12. a moon progressing towards a full moon
Down
- 1. a star currently undergoing nuclear fusion. Spends most of its life in this cycle
- 2. used to describe retrograde motion in a Ptolemaic system of the universe
- 3. this model suggests an earth centered solar system
- 4. a developing young star that has yet to undergo nuclear fusion
- 5. the study of space, or any objects outside of our atmosphere
- 8. a dense accumulation of gas and dust that are the basis for the creation of stars
- 9. a moon progressing towards a new moon