Across
- 2. lightest element
- 5. longest lived of the objects in the unverse
- 7. exist in outer space, measure 0.1mm
- 9. matter and radiation that exist in the space between the star systems in a galaxy
- 12. creation of chemical elements by nuclear fusion reactions within stars
- 13. light and heat from stars is made
- 14. what is left when stars have exhausted all fuel
- 15. very young star
Down
- 1. luminous and short lived
- 3. collapsed core of a massive supergiant star
- 4. theoretical stellar remnant
- 6. place in space where gravity pulls so much that even light can not get out
- 8. biggest explosion that humans have ever seen
- 10. any star that has a hot, dense core
- 11. luminescent part of interstellar medium
- 16. dying star in the final stages of stellar evolution