Across
- 1. Composed mostly by hydrogen and helium
- 7. areas of stars spread out from the center
- 11. Waves taht are very high energy and are also used in medical care
- 12. Information obtained from experiments or observations
- 13. Beginning point at which something begins or derives
- 15. A unit length equal to the distance that light travels in a year
- 16. How fast light is
- 18. The death of a large star
- 19. A tool to use for looking at the stars in the sky at night
- 22. Waves with long wavelengths and low frequencies
Down
- 2. All space and matter
- 3. waves that are between radio waves and something to cook your cold food
- 4. The change that allows to determine if a object is moving towards us or away from us
- 5. Energy of matter/space as electromagnetic waves
- 6. A large group of stars
- 8. Electromagnetic waves with longer wavelengths than visible light
- 9. Solar masses squeezed into a ball
- 10. A theory that says began as a small point and expanded about 13.7 billion years ago
- 14. Distance between two corresponding points
- 17. Provides us with visible light
- 20. Self-luminous consisting a mass of gas held together by gravity
- 21. Huge group of stars that rotate around a center which the sun is a part of