| A | B |
|---|
| Celestial Object | Anything outside of the earth's atmosphere |
| Celestial Sphere | An imaginary circle surrounding the earth. |
| Rotation | Earth spinning around on it's axis |
| Revolution | Time to travel around the sun. |
| Zenith | A point right above the observer |
| Terrestial | Rock planets |
| Jovian | Gas Planets |
| Auroras | Solar flares brought to our planet by our magnetic field |
| Satellites | Any smaller object revolving around a larger object |
| Retrograde Motion | The apparent movement of planets moving backwards. |
| Comet | Big ball of dirty snow |
| Meteor | Light made by a meteroid as it's burned by our atmosphere |
| Asteriod | large masses of rock found on a belt between Mars and Jupiter |
| Orbit | The path in which all celestial objects move. |
| Elliptical Orbit | An Ellipsed shape orbit around the sun |
| Heliocentric | The model in which the sun is in the center of the solar system |
| Geocentric | Model in which the Earth is the center of our solar system |
| Perihelion | Point in which the Earth is closest to the sun. |
| Aphelion | Point in which the Earth is farthest away from the sun |
