Across
- 7. multiple galaxy clusters
- 8. an event at the end of a supergiant stars life, which can shine brighter than the galaxy
- 9. an immensely big star
- 12. what we are made of
- 13. most planets are in these
- 14. planets with a surface
- 17. the fastest thing in the universe
- 19. a really large star
- 20. multiple galaxies
Down
- 1. a large star
- 2. everything
- 3. a small star
- 4. a tiny planet, smaller than 3000km in diameter
- 5. a star with great gravity
- 6. a massive group of stars and planets
- 10. a planet not in a solar system
- 11. an area in space with so much gravity that not even light can escape
- 15. planets made of gas
- 16. one of the smallest things in the universe
- 18. an extremely magnetic neutron star