Across
- 2. Serves as a satellite for planets
- 3. "I'm bout to explode" -Star
- 7. The form of matter the Sun is made of
- 9. Forgotten
- 11. The red dwarf that's supposed to go supernova soon
- 15. Element was named after it
- 16. Got knocked onto its side
- 17. What killed the dinosaurs
- 20. A bundle of stars orbiting a supermassive black hole
- 21. That one god from Spongebob
Down
- 1. Earth's sister
- 4. What keeps us safe from the Sun
- 5. The end result of the Big Bang
- 6. The most potent and destructive blast of energy in the Universe
- 8. They liked it so they put a ring on it
- 10. What keeps us on the ground and revolving around the Sun
- 12. 1.3 million Earths fit inside it
- 13. The thing that makes up the Sun
- 14. Has terrible acne
- 15. Aliens probably live there
- 18. We live there
- 19. Something that's too small to identify as a star or planet