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Across
  1. 4. - When one celestial body obscures another, seven letters
  2. 6. - A highly magnetized rotating neutron star, six letters
  3. 7. - A natural light display, six letters
  4. 10. - The ringed planet, six letters
  5. 11. - The universe seen as a well-ordered whole, six letters
  6. 12. - The force that attracts a body towards the center of the earth, or towards any other physical body having mass, seven letters
  7. 14. - A particle of light, six letters
  8. 15. - A cloud in outer space, six letters
Down
  1. 1. - A distant celestial object, six letters
  2. 2. - The smallest planet, seven letters
  3. 3. - A system of two stars, six letters
  4. 5. - A system of millions or billions of stars, six letters
  5. 8. - A spacecraft, six letters
  6. 9. - A celestial coordinate system, six letters
  7. 13. - A moon mission, six letters