Gravity Still Works!

3. Newton's law stating that every mass attracts every other mass (include the space).
5. Kepler's ___ ___ states that the paths of the planets are ellipses (include the space).
6. The amount of matter in an object.
7. The rate at which velocity changes due to gravity.
11. This scientist developed the law of universal gravitation.
13. Kepler's ___ ___ states that an imaginary line from the Sun to a planet sweeps out equal areas in equal time intervals (include the space).
14. The force that pulls objects towards Earth's center, giving them an acceleration of 9.8 m/s^2
15. A push or pull that can change an object's motion.
16. Kepler's ___ ___ states that the square of the ratio of the periods of any two planets revolving about the Sun is equal to the cube of the ratio of their average distances from the Sun (include the space).
17. This scientist measured the gravitational force between two objects.
20. The force of attraction between two objects must be proportional to the objects' masses (include the space).
23. The separation between two objects that affects gravitational force.

1. All objects are surrounded by this and it affects the motions of other objects (include the space).
2. An oval-shaped path followed by planets around the Sun.
4. That's what G stands for, also known as in 6.67x10^-11 (include the space).
8. The time required for an object to complete one full orbit (include the space).
9. The force of attraction between all objects that have a mass
10. The scientist who discovered the three laws of planetary motion.
12. The path that one object follows as it moves around another object.
18. An object that orbits a planet or larger body.
19. Cavendish's investigation is often called ___ ___ because it helped determine Earth's mass.
21. The speed of an object in a specific direction.
22. The star at the center of the solar system that planets orbit.