Earth, Moon, and Sun

2. the amount of matter in an object
6. the force that attracts all objects towards each other
7. when the sun appears farthest north of the equator once each year and farthest south once each year
9. when an object in space comes between the sun and a third object, it casts a shadow on that object
10. the very darkest part of the moon's shadow
13. the spinning of Earth on its axis
16. "equal night", day and night are each about 12 hours long everywhere
17. the imaginary line that passes through Earth's center and the North and South poles
18. a pattern or group of stars that people imagined to represent a figure, animal, or object
19. the tendency of an object to resist a change in motion

1. a body that orbits a planet
3. push or pull
4. a giant ball of hot gas, mainly composed of hydrogen and helium
5. a system of organizing time that defines the beginning, length, and divisions of a year
8. a cold mixture of dust and ice that gives off a long trail of light as it approaches the sun
11. the streak of light produced when a small object burns up entering Earth's atmosphere
12. the movement of one object around another
14. Earth's path
15. an object that orbits the sun, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit