Cosmic Clues

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Across
  1. 3. A space rock that burns up upon entering Earth's atmosphere (6)
  2. 5. A system of millions or billions of stars held together by gravity (6)
  3. 7. ​A rapidly rotating neutron star that emits radiation (6)
  4. 10. Bowl-shaped depression formed by an impact on a planet or moon (6)
  5. 12. The universe seen as a complex and orderly system (6)
  6. 13. A giant cloud of dust and gas in space (6)
  7. 15. An event where one celestial body blocks light from another (7)
  8. 16. Large natural or artificial object orbiting a planet (9)
  9. 17. The curved path of a celestial object around a star or planet (5)
  10. 18. Saturn's largest moon (5)
  11. 19. ​Celestial body of ice and dust that leaves a tail near the Sun (5)
Down
  1. 1. Vehicle or engine used to launch payloads into space (6)
  2. 2. A device sent to explore the surface of a planet or moon (5)
  3. 4. Famous space telescope launched in 1990 (6)
  4. 5. The force that attracts a body toward the center of the Earth or another physical body (7)
  5. 6. ​A person trained to travel in a spacecraft (9)
  6. 8. The first person to walk on the Moon (9)
  7. 9. ​A rocky body that orbits the Sun, mostly found between Mars and Jupiter (9)
  8. 11. Powerful optical instrument used to view distant space objects (9)
  9. 14. Famous space mission series that landed humans on the Moon (6)