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