69th one

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Across
  1. 6. - A luminous sphere of plasma in space.
  2. 7. System - The Sun and its orbiting celestial bodies.
  3. 9. - Protective gear for astronauts in space.
  4. 10. - A massive system of stars, gas, and dust.
  5. 11. - A celestial object with a tail of gas and dust.
  6. 12. - A small rock or particle in space.
  7. 15. - A cloud of gas and dust in space.
  8. 16. - An object in orbit around a celestial body.
  9. 17. Hole - A region of space with strong gravitational forces.
  10. 18. - Natural light displays in the Earth's sky.
  11. 19. - A planet outside our solar system.
Down
  1. 1. - A celestial body that orbits a star.
  2. 2. - The fourth planet from the Sun.
  3. 3. - Relating to the Moon.
  4. 4. - A person who travels in space.
  5. 5. - The force that attracts objects toward each other.
  6. 6. - An activity conducted by astronauts outside a spacecraft.
  7. 8. - A small rocky object in space.
  8. 13. - A vehicle designed for space travel.
  9. 14. - An optical instrument for observing distant objects.