Our Solar System & Space

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