Astronomy

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Across
  1. 3. An acronym for the International Space Station
  2. 6. The study off all things beyond Earth's atmosphere
  3. 8. The largest planet in the solar system
  4. 9. To travel around an object in space
  5. 10. The hottest planet in the solar system
Down
  1. 1. A collection of stars and planets held together by gravity
  2. 2. The distance it takes light to travel in a year
  3. 4. The planet farthest from the Sun
  4. 5. The force that keeps everything in the universe organized
  5. 7. The planet closest to the Sun