Across
- 2. group of billions of stars
- 6. largest star that has expanded
- 9. region in space with tremendous gravity
- 10. cloud of gas and dust in space
- 13. very small, very dense after a supernova
- 16. brightness of a star
- 17. explosion of a collapsed red giant
Down
- 1. how bright a star looks
- 3. distance that light travels in one year
- 4. pattern of stars seen from Earth
- 5. particle combine to form new particle
- 7. how bright a star actually is
- 8. group of stars, our solar system belongs
- 11. small, white, hot, dense star after a nova
- 12. everything that exists
- 14. explosion of a collapsed supergiant
- 15. star that has expanded after using hydrogen up