6s

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Across
  1. 2. - A specific task or purpose, especially one assigned to a person or group (7 letters, seven)
  2. 7. - Vehicle designed to move across the surface of the moon (10 letters, ten)
  3. 9. - Vehicle designed for travel or operation in outer space (10 letters, ten)
  4. 10. - Study of celestial objects and phenomena (9 letters, nine)
  5. 11. - The third planet from the sun (5 letters, five)
  6. 13. - Debris in orbit around Earth (9 letters, nine)
  7. 14. - Small body of matter entering the Earth's atmosphere (6 letters, six)
Down
  1. 1. - Occurring or situated between stars (12 letters, twelve)
  2. 3. - Astronaut activity outside a spacecraft (9 letters, nine)
  3. 4. - Force that attracts objects toward each other (7 letters, seven)
  4. 5. - All existing matter and space considered as a whole (8 letters, eight)
  5. 6. - Prominent constellation named after a mythological hunter (5 letters, five)
  6. 8. - Occurrence when one celestial body blocks another (7 letters, seven)
  7. 9. - Protective garment worn by astronauts (9 letters, nine)
  8. 12. - Study of the origin and evolution of the universe (9 letters, nine)