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Across
  1. 2. - A massive system of stars, gas, dust, and dark matter.
  2. 7. - An activity in which astronauts leave a spacecraft and float in space.
  3. 9. - Protective clothing worn by astronauts in space.
  4. 11. - A luminous celestial object that emits light and heat.
  5. 13. - A trained space traveler who journeys beyond Earth.
  6. 14. - The force of attraction between objects in space.
  7. 16. - An optical instrument used to observe celestial objects.
  8. 18. - An artificial object placed in orbit around a celestial body.
Down
  1. 1. - A celestial body that orbits a star.
  2. 3. - Relating to the Moon or moon-related phenomena.
  3. 4. - A vast cloud of gas and dust in space.
  4. 5. - The force that governs the attraction between celestial bodies.
  5. 6. - Life or phenomena originating from other planets or space.
  6. 8. - Relating to the Moon or moonlight.
  7. 9. System - The Sun and its orbiting celestial bodies.
  8. 10. - A small rock or particle in space.
  9. 12. - A vehicle designed for space travel and exploration.
  10. 15. - A celestial object composed of ice, dust, and gas.
  11. 17. Hole - A region of space with extremely strong gravitational forces.