Across
- 3. a surface that turns inward
- 5. what is the unit that is used to measure the distance between the earth and the sun
- 6. what affects the earths tides
- 8. something in space that orbits around another planet
- 9. when is the earth closest to the sun
- 11. what moves the fastest in the universe\
- 13. how many years did it take for stars to appear after the big bang
- 15. what is the most abundant element in the universe
- 16. what hits our eyes to make it possible to see light
- 17. what is the brightest star in the sky
- 20. what color dwarf will our sun be when it dies
- 21. how may seasons are there
Down
- 1. a group of stars that are seen in a recognizable pattern
- 2. what type of light can humans see
- 4. what holds everything together
- 5. what is the belt between the terrestrial planets and the gas giants
- 7. who discovered gravity
- 10. can you hear in space
- 11. what affects the period of a pendulum
- 12. how many gas planets are there
- 13. rip what is one possible end of the universe
- 14. what do some planets go through when they orbit around the sun
- 18. what is the color of a star if it is moving away from the earth
- 19. what kind of eclipse is it when the moon blocks the sun