Space Croses

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Across
  1. 6. A galaxy that is neither elliptical nor spiral.
  2. 7. Tens of thousands of stars held together by gravity.
  3. 9. Nuclear fusion in the star's core produces helium from hydrogen.
  4. 12. The study of the universe.
  5. 13. Our Galaxy.
  6. 14. A ball of glowing gas at a very high temperature.
  7. 15. It appears as a rotating disk of stars and dust.
Down
  1. 1. An egg shaped, rotating galaxy.
  2. 2. A group of stars.
  3. 3. A galaxy that only contains a few million to a billion stars.
  4. 4. Two stars orbiting one another.
  5. 5. Hypothetical form of energy that makes up most of the universe.
  6. 8. An object so dense that nothing can escape it, not even light.
  7. 10. Everything in existence.
  8. 11. Method of measurement for stars that are relatively close to Earth.