8s

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Across
  1. 2. - Spiral galaxy containing our solar system (8 letters, eight)
  2. 3. - Theater for viewing images of celestial bodies (11 letters, eleven)
  3. 4. - Force that attracts objects toward each other (7 letters, seven)
  4. 6. - Occurrence when one celestial body blocks another (7 letters, seven)
  5. 7. - Relating to the universe (6 letters, six)
  6. 11. - Relating to the moon (5 letters, five)
  7. 12. - Astronaut activity outside a spacecraft (9 letters, nine)
  8. 14. - Relating to a galaxy (8 letters, eight)
  9. 15. - Luminous phenomenon in the Earth's atmosphere (6 letters, six)
Down
  1. 1. - Russian astronaut (9 letters, nine)
  2. 5. - Occurring or situated between stars (12 letters, twelve)
  3. 8. - Protective garment worn by astronauts (9 letters, nine)
  4. 9. - Region of spacetime with gravitational pull (9 letters, nine)
  5. 10. - Relating to the sun (5 letters, five)
  6. 13. - Vehicle designed for travel or operation in outer space (10 letters, ten)