Earth, Moon, and Sun

4. One of the factors that affects gravity-explains why we do not feel the gravity of other galaxies.
5. __________ of the moon is ALWAYS lit up, even if we do not see it all.
6. When the amount of light on the Moon is growing.
9. Spinning in circles around an imaginary line.
10. When more than half of the Moon is lit up.
12. When less than half of the Moon is lit up.
13. The ________ of Earth's axis is about 23.5 degrees.
15. Another word for revolution.
18. Gravity is an _________ force.
19. One of the factors that affects gravity-explains why we do not feel the gravity of almost every object around us.

1. Different shapes of the Moon we see every 29.5 days.
2. Caused by Earth's revolution.
3. Moving in circles around another object.
7. The ___________ of sunlight striking the Earth causes different amounts of energy to be absorbed.
8. The force that pulls all objects made of matter together.
9. When the moon is waxing, we see light on this half of the moon.
11. These occur because the Earth is tilted.
14. The distance between objects in space is very __________.
16. Caused by Earth's rotation.
17. When the amount of light on the Moon is shrinking.