| Planet Name | Comparing size by diameter |
Mercury |
4,900 km |
Venus |
12,100 km |
Earth |
12,756 km |
Mars |
6,800 km |
Jupiter |
142,800 km |
Saturn |
120,660 km |
Uranus |
52,400 km |
Neptune |
49,500 km |
Pluto |
2,300 km |
 Diameter
is the
length of a straight line through the center of an object
- the object in our case being the planets! In other
words, diameter would be how big across the planet is. |