Space and planets

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Across
  1. 2. The event when one celestial body moves into the shadow of another.
  2. 4. A large celestial body that orbits a star and does not produce its own light.
  3. 5. A group of stars forming a recognizable pattern in the night sky.
  4. 7. The layer of gases surrounding a planet or moon.
  5. 8. A device used to observe distant objects in space.
  6. 11. A region in space where gravity is so strong that nothing can escape it.
  7. 16. The distance light travels in one year, used to measure vast distances in space.
  8. 18. The force that attracts objects toward the center of a planet or star.
  9. 19. The group of planets, moons, and other celestial bodies that orbit the Sun.
  10. 20. A large system of stars, gas, and dust bound together by gravity.
Down
  1. 1. A person trained to travel in a spacecraft.
  2. 3. A small rocky body that orbits the Sun, usually found in the asteroid belt.
  3. 6. A vehicle designed to travel in space.
  4. 9. An object that orbits a planet or star, either natural or artificial.
  5. 10. A piece of rock or metal from space that burns up in Earth's atmosphere.
  6. 12. An icy body that releases gas and dust as it approaches the Sun.
  7. 13. The path of a planet or object around a star or another celestial body.
  8. 14. The scientific theory that explains the origin of the universe.
  9. 15. The galaxy that contains our Solar System.
  10. 17. A natural satellite that orbits a planet.