Across
- 2. The boundary of a black hole where nothing can escape
- 5. A galaxy shaped like a round or flattened ball, generally containing only old stars
- 7. A gaseous planet that is roughly between 2x and 4x the size of Earth (include hyphen)
- 9. Our Supercluster
- 12. A planet outside our own solar system
- 13. A large collection of galaxy clusters that are often separated from one another by a massive void
- 14. A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
- 17. A galaxy that does not have a regular shape
- 18. An exoplanet that is roughly the size of Jupiter or Satur
- 19. Our Galaxy
- 20. A group of galaxies bound by gravity
- 21. A spiral galaxy with a central bar-shaped structure composed of stars.
Down
- 1. An exoplanet that is Earth-sized and smaller. It is often with a rocky surface and may or may not have an atmo
- 3. An exoplanet that is roughly the size of Uranus and Neptune
- 4. Cosmological theory that explains the sudden development of the universe through expansion from a hot, dense state.
- 6. a large group of stars that together make a shape that has a central bulge but no spiral arms
- 8. The shift to a different wavelength in relation to the observer. The further away, the redder the wavelength becomes.
- 10. A point in which matter is infinitely dense, as in the center of a black hole
- 11. a galaxy with a central region in the middle and arms that spiral outward in a pinwheel pattern
- 13. An extrasolar planet with a mass higher than Earth's, usually up to 2x; May or may not have an atmo
- 15. A force of attraction between objects that is due to their masses.
- 16. Matter that emits no light and we do not understand