Astronomy Crossword Puzzle

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Across
  1. 2. An area in space with gravity strong enough to prevent light from escaping
  2. 4. Pieces of rock that fall from space, creating a streak of light in the sky
  3. 8. A star explosion
  4. 11. The distance between the center of the Earth to the center of the Sun
  5. 13. A repeating path an object takes in space due to gravity
  6. 14. A collection of stars that form certain shapes in the sky
  7. 17. Any object in space that orbits a planet or star
  8. 18. The spinning motion of an object around its axis
  9. 19. The distance light travels in a year
Down
  1. 1. A star and the objects that orbit it
  2. 3. The ejection of charged particles from a sun
  3. 5. The layer of gases covering a celestial body
  4. 6. A massive collection of stars and their solar systems
  5. 7. The universe is everything in space including innumerable galaxies
  6. 9. An relatively small object orbiting the sun comprised of metals and minerals
  7. 10. A lump of frozen gas, rock and dust that orbits the sun
  8. 12. An object from space that passes through an atmosphere and hits the ground
  9. 15. A massive cloud of dust and gas in space in which new stars are born
  10. 16. The very dense, collapsed core of a star
  11. 17. A glowing ball of gas held by its own gravity and powered by nuclear fusion