| A | B |
|---|
| Mercury | planet closest to sun |
| Venus | planet with thick cloud cover |
| Earth | only planet with known life |
| Mars | the red planet |
| Jupiter | planet with the "big red spot" |
| Saturn | planet with rings |
| Neptune | planet tilted sideways on axis |
| Uranus | the 8th planet from sun, a Jovian planet |
| Pluto | planet with both terrestrial and jovian properties |
| ellipse | flattened oval |
| fusion | joining together of nuclei |
| luminosity | brightness |
| Big Bang Theory | how the universe formed |
| Evidence of Big Bang | background radiation & doppler shift |
| perihelion | closest to sun in orbit |
| apehelion | farthest from sun in orbit |
