Across
- 6. Distance that light travels in one year.
- 7. Brilliant explosion of a collapsed red giant.
- 9. Group of billions of stars.
- 10. Pattern of stars seen from Earth.
- 12. Cloud of gas and dust in space.
- 14. Everything that exists.
- 16. How bright a star looks.
- 17. Star that has expanded after using up its hydrogen.
Down
- 1. Region of space with tremendous gravity, caused by the collapse of a huge star.
- 2. How bright a star actually is.
- 3. Group of stars to which our solar system belongs.
- 4. Brilliant explosion of a collapsed supergiant.
- 5. One of the largest stars, formed when a star expands after using up its hydrogen; larger than a red giant.
- 8. Small, white, hot, dense star that remains after a nova.
- 11. Very small, dense star that remains after a supernova.
- 13. Process by which particles combine to form a new particle.
- 15. Brightness of a star.