Space-related terms

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Across
  1. 4. system A system that includes a star and all the objects that orbit it
  2. 5. A vehicle designed to propel itself through space
  3. 6. The force that attracts objects toward each other
  4. 9. A massive system of stars, gas, and dust held together by gravity
  5. 10. A celestial body that orbits a star and is not a moon
  6. 11. An instrument used to observe distant objects in space
  7. 12. A natural satellite that orbits a planet
  8. 13. All of space and everything in it
  9. 15. response
Down
  1. 1. A vehicle designed for travel or operation in outer space
  2. 2. A celestial object made of ice and dust that orbits the Sun
  3. 3. A large, glowing ball of gas in space
  4. 7. A scientist who studies celestial objects and phenomena
  5. 8. An object that orbits a planet or a star
  6. 12. A small piece of rock or metal that burns up in Earth's atmosphere
  7. 14. The path an object takes as it revolves around another object
  8. 16. A person who travels and works in space