Across
- 3. A cloud of dust and gas in which stars are formed.
- 6. Measures the number of complete wave cycles in a period of time.
- 7. A naturally formed object that orbits a planet.
- 8. A term used to describe round galaxies.
- 11. One __ unit is equal to the average distance between the Earth and the Sun.
- 12. A frozen ball of dust and gas that orbits a star.
- 13. An irregularly-shaped rocky mass that orbits a star.
- 14. The force that maintains the structures of components in the universe.
- 15. The height of the wave
- 16. The distance from a wave's crest to the next crest.
Down
- 1. The first atoms to form.
- 2. Light waves compress as the object emitting them moves towards the observer.
- 4. Light waves stretch out as the object emitting them moves away from the observer.
- 5. A fancy way of saying "to move away."
- 7. The type of radiation that can be found all over the universe which likely resulted from the Big Bang.
- 9. A unit used to measure the distance between stars or the size of large objects such as a galaxy.
- 10. Composed of billions of stars.