Unit 1 E.En

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Across
  1. 2. small nod or bob caused by moon
  2. 4. electromagnetic waves
  3. 7. earth is center of universe
  4. 9. equal area in equal time
  5. 11. amount of matter
  6. 15. square of orbital period
  7. 17. path of celestial body around sun
  8. 19. releases heat and light
  9. 22. turning sunlight into food
  10. 23. change in axis position
  11. 24. joining of two nuclei
Down
  1. 1. planets, moon, sun
  2. 3. center of mass between 2 or more object
  3. 5. uneven heating of earth
  4. 6. elliptical orbit
  5. 8. orbits stars
  6. 10. sun is center of the universe
  7. 12. attraction between two objects
  8. 13. sun energy into thermal and electrical
  9. 14. splitting of atoms
  10. 16. spinning on axis
  11. 18. entirety of space and time
  12. 20. energy in chemical bonds
  13. 21. imaginary line