Across
- 3. Beginning point of when something begins
- 4. ___ Waves-Electromagnetic waves;long wavelengths
- 5. Wavelength change; determines if object is moving away
- 9. The death of a star
- 11. A large group f stars in space
- 13. Transfers through matter as electromagnetic waves
- 15. ___ Waves- Waves emitted by a radioactive atom
- 16. Gravity so strong that light can't escape
- 17. ___-Shaped Galaxy-has long arms going around the center
- 18. Our planets revolve around the star
- 19. Waves between two corresponding distances
- 21. ___ Waves-Provides the colors we see
Down
- 1. Scientific ___-Ideas that have been supported
- 2. The time it takes light to travel 9.5 trillion km
- 6. Waves that are used in medical assistance
- 7. So called the beginning of the universe
- 8. Unit that compares other stars to the Sun
- 10. Has a shorter wavelength than visible light
- 12. The matter that space contains
- 14. Galaxy that our planets and Sun are in
- 20. Helps see stars and the moon better