Across
- 1. two atoms combining
- 4. center of mass of two bodies orbiting each other
- 9. motion along a path around a point in space
- 11. direct transfer of heat
- 13. the theory that the universe exploded from a single point
- 14. the slow movement of earth's axis
- 15. transfer of heat by electromagnetic waves
- 17. wobbling of earth's axis
- 20. when a planet is closest
- 22. BURN
- 23. greatest difference between high and low water
- 24. two times of the year with the longest or shortest day of the year
- 25. neither hemisphere is tilted towards the sun, day and night are equal lengths at this time
Down
- 2. range of the electromagnetic spectrum (it's in this sentence)
- 3. when a planet is farthest
- 5. hotter part of fluid rising
- 6. shortwave radiation emitted by the sun
- 7. electrically charged particles produced by the sun's corona
- 8. the spin of something on its axis, takes earth 24 hours
- 10. light turning blue as it moves closer
- 12. light turning red as it moves farther away
- 16. study of universe
- 18. least difference between high and low tide
- 19. plants turning sunlight into energy
- 21. an atom splitting