Space Exploration

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Across
  1. 1. chunk of ice and rock coming from the outer solar system
  2. 6. a rock in orbit between Mars & Jupiter
  3. 8. force of attraction between objects that is due to their mass
  4. 9. a small meteoroid
  5. 11. huge collection of gas, dust and billions of starts & solar systems
  6. 15. where stars are born
  7. 16. space rock that enters Earth's atmosphere and burns up
  8. 17. gas needed for humans to survive
  9. 18. natural objects that orbit a planet
  10. 19. area where life is able to exist
  11. 20. shape of our galaxy
  12. 21. International Space Station
Down
  1. 2. name of our galaxy
  2. 3. ball of gas and dust
  3. 4. small amount of gravity
  4. 5. energy in the form of waves
  5. 7. an object orbiting a star that is large
  6. 10. characteristics necessary for life
  7. 11. keeps the atmosphere on the planet
  8. 12. protects us from harmful radiation
  9. 13. everything that exists - all matter & energy
  10. 14. Earth is ideal distance from