Crossword Puzzle Assignment Unit 3A

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Across
  1. 7. Dark areas that form on the surface of the sun.
  2. 9. Earth and the other planets orbiting the sun.
  3. 11. Apparent shift in the position of the stars changing as the Earth moves.
  4. 12. When an object is farthest from the sun.
  5. 17. When particles attract every other particle.
  6. 18. A force that attracts objects due to their masses and distances.
  7. 19. An explosion release of energy that extends into outer space.
  8. 20. An act of turning.
Down
  1. 1. A concept used by historians.
  2. 2. A path that a body travel as it goes around another body.
  3. 3. The act of a fluid that is hot and has little density.
  4. 4. An explanation of what happens to the natural world.
  5. 5. When two or more low-mass atomic nuclei fuse to form another.
  6. 6. Extend outward about 100km
  7. 8. A cloud from where the solar system form.
  8. 10. The inward force causing an object to move in the inward force.
  9. 13. The sun and all the bodies that orbit the sun.
  10. 14. Large bodies where planets are formed.
  11. 15. The sun and the other planets orbiting the Earth.
  12. 16. When an object is closes to the sun.