Cosmic Clues: A space themed crossword

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Across
  1. 2. an organized effort to achieve a particular goal, often in space exploration
  2. 4. the path that a celestial object takes around another object in space
  3. 9. a cloud of gas and dust in space that can give birth to new stars
  4. 13. referring to life or intelligence beyond Earth
  5. 14. a small, rocky object that orbits the sun
  6. 16. an instrument used to observe distant objects in space
  7. 17. a small piece of rock or debris in space
  8. 18. a small icy body that travels through space and produces a visible coma or tail
Down
  1. 1. the force that attracts objects with mass towards each other
  2. 3. SUIT protective clothing worn by astronauts in space
  3. 5. a region of space with a gravitational force so strong that nothing can escape it
  4. 6. a vast collection of stars, gas, and dust held together by gravity
  5. 7. referring to the space between stars
  6. 8. relating to the moon
  7. 10. a vehicle designed to travel and operate in space
  8. 11. a large celestial body that orbits a star and does not produce its own light
  9. 12. a person trained to pilot, navigate, or otherwise participate in a spacecraft
  10. 15. a vehicle that obtains thrust from a rocket engine to propel itself into space