22. Outer Space

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Across
  1. 2. System A group of worlds, moons, and other objects that all travel around one central star.
  2. 3. A natural object that orbits a planet.
  3. 5. The curved path one object takes around another in space.
  4. 6. Way The spiral-shaped collection of billions of stars where our solar system lives.
  5. 8. A vehicle that uses powerful thrust to travel into a vast emptiness.
  6. 9. The star at the center of our solar system that gives us light and warmth.
  7. 11. A person trained to travel and work beyond a world's atmosphere.
  8. 13. A small, rocky object that orbits a star, usually found in a belt.
  9. 14. A small, icy body that orbits a star and develops a bright tail when it gets close.
Down
  1. 1. A huge group of stars, gas, and dust held together by gravity.
  2. 3. A streak of light seen when a space rock burns up in a world's air.
  3. 4. A large, round object that orbits a sun.
  4. 7. A huge ball of burning gas that gives off light and heat.
  5. 10. Everything that exists, including all the space, matter, and energy.
  6. 12. A tool that makes distant objects in the sky appear closer and bigger.