Across
- 2. end stage of supermassive stars
- 3. the rise and fall of sea levels that usually occur twice daily
- 5. most massive and luminous stars found above the main sequence
- 6. a galaxy shaped like a pinwheel
- 9. systems of dust, gas, stars and interstellar matter
- 10. a spherical or elongated galaxy with a bright center and very little dust
- 12. the diagonal region on the H-R diagram where stars spend most of their lives
Down
- 1. chemical reaction where the nucleus of two atoms combines
- 4. a galaxy with no specific shape
- 7. when a star or galaxy is moving away from the spectrum
- 8. a large cloud of dust and gas where stars are born
- 11. ocean water that is pulled away from the shorelines