INNER PLANETS

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Across
  1. 5. The hottest planet in our solar system
  2. 6. Responsible for the civil space program, aeronautics research, and space research in the US
  3. 9. The first European space craft to explore Venus
  4. 10. Currently on a mission to explore Mars to prepare for future human exploration
  5. 12. Did a "Flyby" of Venus on Dec 14, 1962
  6. 14. Makes up 21% of Earths atmosphere
  7. 15. 4th planet from the sun
Down
  1. 1. A layer that protects life from the sun's radioactive waves
  2. 2. A layer of gases surrounding a planet or celestial body
  3. 3. Another word for inner planet
  4. 4. Named after Italian mathematician and engineer
  5. 7. First Satellite to be launched into the atmosphere. Launched by the Soviet Union
  6. 8. One year here is 88 earth days
  7. 11. I used Venus' gravitational pull to help guide my to Mercury
  8. 13. The only habitable planet in the solar system