Space

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Across
  1. 2. something that orbits a planet
  2. 6. the revolution of a planet around the sun
  3. 8. an icy body in space with a luminous tail
  4. 12. the reason things fall down
  5. 13. a small piece of rock that floats in space
  6. 14. planets small, rocky planets close to the sun
  7. 19. a large rock in space that orbits the sun
  8. 20. a meteoroid that hits earth's surface
  9. 21. shines on its own like the sun
  10. 22. giants large planets made of gas
  11. 23. objects that orbit planets such as the moon
  12. 24. brightness how bright a star would be if it were the same distance from the earth
Down
  1. 1. a large body that orbits a star and does not shine on its own
  2. 3. the circular path followed by planets
  3. 4. a huge home for stars and planets
  4. 5. The vast space that contains everything
  5. 7. a ball of fire that suddenly appears in the sky
  6. 9. a hot, gaseous body that emits light and heat
  7. 10. does not emit light; only reflects light
  8. 11. year a unit that measures distance in space and time
  9. 15. the rotation of a planet around itself
  10. 16. system a system that includes the sun and all the planets that orbit it
  11. 17. a stellar pattern visible in the sky
  12. 18. cluster a group of stars that appear