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