Across
- 6. Discovered galaxies beyond our own
- 10. Earth centered universe
- 11. Two elements that are involved in nuclear fusion
- 12. Days it takes the moon to make one complete cycle
- 14. One of these equals one day
- 15. Days it takes the moon to go from full to new
- 16. Shape of the Milky Way Galaxy
- 18. Actual brightness of light produced by star
Down
- 1. Scientific theory explains formation of the universe.
- 2. Stars that can be seen at all times of the year
- 3. Sun centered universe
- 4. Discovered moons around Jupiter and sun spots
- 5. Effect caused by wavelengths compressing & expanding
- 7. Galaxy is moving away from us
- 8. One of these equals one year
- 9. Measure of brightness as seen from one location
- 13. Name of our home galaxy
- 17. The distance light travels in one year. 6 trillion miles