Across
- 4. the blue-white core that is left behind and cools
- 6. a stars actual brightness
- 8. a theory of how the universe was formed
- 9. a stars brightness as seen from earth
- 10. a group of single stars
Down
- 1. all of space and everything in it
- 2. the explosion of a supergiant star
- 3. a contracting cloud of gas and dust with enough mass to form a star
- 5. a large cloud of gas and dust containing an immense volume of material
- 7. the distance light travels in a year