Formation of the Galaxy

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Across
  1. 3. more light than shadow
  2. 6. large mass of stars
  3. 7. about half of the moon is shaded
  4. 11. light of the moon is on the right; light grows
  5. 13. occurs when the moon covers part or all of the sun
  6. 16. forge pulling objects toward one another
  7. 18. the sun and the group of planets that revolve around it
Down
  1. 1. The ___ of the earth causes seasons
  2. 2. tiny particles of matter floating in space
  3. 4. the most widely accepted theory to explain the creation of the universe
  4. 5. the name of our galaxy
  5. 8. happens when the moon passes into Earth's shadow
  6. 9. the shape of the illuminated portion of the sun
  7. 10. more shadow than light
  8. 12. galaxies form after a star goes ___
  9. 14. Mercury, Venus, Earth, and Mars are ___ planets
  10. 15. a self-luminous celestial body
  11. 16. matter with an indefinite shape and volume
  12. 17. light of the moon is on the left; light fades