Into the universe

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Across
  1. 2. A large object with large amounts of energy, powered by a black hole
  2. 5. A hole where radiation can escape in space
  3. 6. The galaxy in which the solar system holds earth, planets, etc.
  4. 7. A star that is the size of a planet when the low mass has used up all its fuel.
  5. 9. A rock that orbits the sun
  6. 10. A planet that orbits a star
  7. 13. system A star system of suns, stars, and planets
  8. 15. A theory of how the universe began
  9. 16. A cloud of gas and dust that nurses new stars
  10. 17. A body of matter that enters the earth's atmosphere
  11. 18. A large, round body/ball that orbits around the sun
  12. 19. A ball of gases, dust, and rocks that orbit the sun
  13. 20. A large planet consisting of helium and hydrogen
  14. 21. a luminous body of light naturally produced and visible in dark/at night
Down
  1. 1. A system of gas, dust, stars, energy, and gravity
  2. 3. A celestial body that orbits around planets
  3. 4. A Group of stars that form a pattern, which is configured at birth
  4. 6. a natural satellite that reflects light from the sun at night
  5. 8. A star that shows brightness increasing over a course of months
  6. 11. Particles that are composed and not reactive in reflecting, absorbing, or emitting any light.
  7. 12. A matter that contains particles
  8. 13. A star that increases its brightness when explosions occur
  9. 14. A small planet
  10. 18. A magnetized star that produces electromagnetic radiation