Size range 0.05 to 2.5 Earth masses. These are the commonly called the 'rocky planets' but this is a deceptive name as not all of these worlds are rocky. Their composition can be quite varied, as can their surface features and conditions. In general they can be defined as small dense worlds consisting mainly of elements heavier than hydrogen and helium, with a liquid or solid surface.
Text by John M. Dollan in his Planet Classification List
Initially published on 09 January 2002.