Across
- 4. day when the sun crosses the equator
- 7. wave encoded with varying amplitude
- 11. when the Earth, Moon & Sun are in perfect alignment
- 12. collection of stars, gas, and dust that is held together by gravity
- 14. wave in which particles oscillate parallel to the wave
- 15. waves change direction
- 16. wave that does not require a medium
- 22. what waves transfer
- 24. 23.5° (2 words)
- 25. waves bounce off it
- 27. height of a wave from rest to crest
- 30. seasons are caused by the Earth’s …
- 31. code comprised of 0s and 1s
- 33. Sun and Moon gravitational forces work together, resulting in large tides (2 words)
- 34. all of the large and small objects that orbit the sun (2 words)
- 36. smooth and continuous wave
- 38. low point of a wave
- 39. scientist provided first evidence of expanding universe (2 words)
Down
- 1. waves goes through it
- 2. wave in which particles oscillate perpendicular to the wave
- 3. universe is getting bigger
- 5. years are caused by …
- 6. day when the sun is as far north or south of the equator as possible
- 8. force of attraction between objects that is due to their masses
- 9. distance from crest to crest
- 10. 5.1° (2 words)
- 13. path of an object as it revolves around another object in space
- 17. on average, every planet’s closest planetary neighbor
- 18. Sun and Moon gravitational forces partially cancel out, resulting in small tides (2 words)
- 19. number of waves per second
- 20. different apparent shapes of the moon that repeat over 29.5 days
- 21. wave that requires a medium
- 23. day and night are caused by …
- 26. wave encoded with varying frequency
- 28. type of wave stored as binary code
- 29. high point of a wave
- 32. space and all of the matter and energy in it
- 35. transfer energy from wave to medium
- 37. point on standing wave with minimum amplitude