Astronomy Review

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Across
  1. 6. chemical reaction in the sun's core to create photons
  2. 8. the movement of one object around another
  3. 9. layer of the sun light comes from
  4. 11. similar to mass but affected by gravity
  5. 12. center of our solar system; most mass so most gravity
  6. 13. a force that slows a falling object
  7. 14. the direction the earth revolves the sun
  8. 17. sun centered solar system
  9. 18. cooler dark patches on the surface of the sun
Down
  1. 1. if distance increases then gravity _____
  2. 2. man who first studied gravity
  3. 3. an invisible pull between two objects
  4. 4. how much matter is in an object
  5. 5. an inverse factor of gravity
  6. 7. earth centered solar system
  7. 10. the outside of an area affected by air
  8. 15. if mass increases then gravity _____
  9. 16. layer of the sun where the color comes from