Crossword Puzzle

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Across
  1. 3. large, almost round object that moves around the sun, doesn’t have a clean orbit; has other objects such as asteroids and comets
  2. 6. group of stars that form shapes
  3. 7. star that explodes or die
  4. 8. a group of galaxies
  5. 10. a group of billions of stars united by gravity
  6. 11. an elliptical, almost circular path
  7. 12. a ring of frozen celestial objects located beyond Neptune
  8. 15. force of attraction that an object exerts on others due to its mass
  9. 16. orbit a star that is not the sun
  10. 18. the science that studies the universe
  11. 19. everything that exists in space and time
  12. 20. brightness of a star
  13. 21. a yellow dwarf star
Down
  1. 1. the distance light takes to travel in a year
  2. 2. a large celestial object that moves around a star
  3. 4. movement around the sun
  4. 5. movement around its own axis
  5. 7. formed by a star and the celestial bodies that orbit around it
  6. 9. bodies that orbit a planet or a dwarf planet
  7. 13. theory that proposes the origin of the universe
  8. 14. measures the force of gravity acting on an object
  9. 17. measures how much matter an object contains