Solar System Unit

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Across
  1. 5. used the telescope to support the heliocentric model
  2. 6. the coolest part of the sun
  3. 8. the thin, middle layer of the sun
  4. 9. surface contains iron and oxygen (iron oxide)
  5. 10. gas ____, another name for the 4 outer planets
  6. 12. the center of the sun
  7. 16. the layer of the sun that we see
  8. 18. icy dirtball
  9. 19. helped Kepler disprove that planets moved in perfect circles
  10. 20. atmosphere consists of carbon dioxide making the surface very hot
Down
  1. 1. largest planet (10x that of Earth's diameter)
  2. 2. space rock that gets through Earth's atmosphere and hits Earth
  3. 3. eruptions of hot gas from the sun's surface
  4. 4. developed the heliocentric system
  5. 7. space rock that gets burned up in Earth's atmosphere
  6. 11. developed the geocentric system
  7. 13. all outer planets have moons and ____
  8. 14. smallest planet
  9. 15. proved the planets orbit was elliptical
  10. 16. sent out to learn more about our solar system and beyond
  11. 17. outermost layer of the sun's atmosphere