Out of this World!

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Across
  1. 1. The planet known as the Red Planet
  2. 4. A place where astronauts live and work in space
  3. 5. The force that keeps us on the ground
  4. 7. A scientist who studies space
  5. 9. A giant group of stars, dust, and gas
  6. 11. A vehicle that travels into space
  7. 14. A tool scientists use to see faraway objects in space
  8. 17. A massive cloud of dust and gases where new stars are born.
Down
  1. 1. The closest planet to the Sun
  2. 2. A machine that helps us explore other planets
  3. 3. The fastest thing in the universe
  4. 6. Earth’s natural satellite
  5. 8. What astronauts wear to survive in space
  6. 10. A person trained to travel in space
  7. 12. The layer of gases around Earth
  8. 13. A rocky object that falls to Earth from space
  9. 15. The path a planet takes around a star
  10. 16. The star at the center of our solar system