Planetary bodies differ from one another in their composition, but most of those in the Solar System have solid surfaces  Unless the core of such a planetary body generates enough heat to cause volcanic action, the surface of the body will not be renewed for millions of years  Any planetary body with a solid surface whose surface is not renewed for millions of years becomes heavily pockmarked by meteorite craters, just like the Earth' s Moon
Some old planetary bodies in the Solar System, such as Europa, a very cold moon belonging to Jupiter, have solid icy surfaces with very few meteorite craters
If a planetary body does not have a heavily pockmarked surface, its core does not generate enough heat to cause volcanic action.