| A | B |
|---|
| satellite | object travels around a planet |
| perturbations | mall variations in motion |
| comets | "dirty snowballs" |
| nucleus | solid part of comet |
| coma | "fuzzy" atmosphere around comet |
| tail | gases flowing behind nuceus |
| name planets in order | M V E M J S U N P |
| geocentric | earth is at the center of the universe |
| heliocentric | sun is at the center of the universe |
| asteroid | small rocky body orbiting the sun |
