Space Vocab

3. the amount of matter in an object
5. a push or pull exerted on an object
8. the scientific law that states that every object in the universe attracts every other object
11. either of the two days of the year on which neither hemisphere is tilted toward or away from the sun
13. the tendency of an object to resist a change in motion
14. a measure of the force of gravity on an object

1. the scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force
2. a system of organizing time that defines the beginning, length and divisions of a year
4. the path of an object as it revolves around another object in space
6. the movement of an object around another object
7. either of the two days of the year on which the sun reaches its greatest distance north or south of the equator
9. the spinning motion of a planet on its axis
10. an imaginary line that passes through a planet's north and south poles, about which the planet rotated
12. the attractive force between objects