| A | B |
|---|
| Revolution | A small object orbiting around another larger object |
| Gravity i the Solar System | It pulls the planets around the Sun |
| Gravity on Earth | It pulls everything equally towards the center of the planet |
| Year | The time it takes the Earth to orbit the Sun one time |
| Slowing down of the Earth's Revolution | Rotation on the Earth is causing it's orbit motion to slow down |
| Speed of Revolution | 66,000 miles per hour |
| Every Second we orbit | 18 miles are covered |
| 365.25 days | 8,766 hours |
| Speed = | Distance divided by Time |
| We can't feel the Earth spin or orbit because: | Gravity holds us down to the planet |
| Telescope | Is needed to prove that the Earth Revolves |
| He made & used the first Telescope | Galileo |
| Galileo's arrest | Few believed he could see and prove that the Earth Revolved |
| Starlight changes as it enters a telescope | Because the Earth is orbiting or moving through space |
| The faster you run in the rain | The more the rain will hit you in the face |
| Half the stars seem to be going away from us | Half the stars seem to be coming towards us |
| Parallax | As we orbit the Sun, close objects in the sky appear to move back and forth over a year. |
