1. Physics of the Solar System
The way things move

2. The Solar System All objects orbit counterclockwise around the Sun
They move at different speeds over different distances

3. The path one object takes when revolving around another object.
Orbits
The path one object takes when revolving around another object.

4. Circles
A circle has only one focus

5. Ellipse
Made in the same way but has two foci

6. Kepler’s Laws of Planetary Motion
The orbits of the planets are ellipses, with the Sun at one focus.

7. Kepler’s Laws of Planetary Motion
2. Planets move faster in their orbit when they get closer to the Sun.

8. Kepler’s Laws of Planetary Motion

9. Kepler’s Laws of Planetary Motion
3. Planets closer to the sun move faster than planets further away.

10. Kepler’s Laws of Planetary Motion

11. Most of Kepler’s Laws can be explained with gravity
Laws of Gravitation
Most of Kepler’s Laws can be explained with gravity
Without the gravity of the sun, planets would move in a straight line.

12. Laws of Gravitation
m1*m2
G = d2