This picture extends the circle into a three dimensional sphere.
There is a lot more
planet when we increase the radius!
So if there is more matter, there will
be more gravity, right?
Well, partly right. Density also has
something to do with it.
Review the page on Weight,
Mass and Density.
A planet made of metal will have a much
higher density than one made of ice -- or
This page will help you to figure out
the gravity that there is on the surface of your world.