terrestrial planet

terrestrial planets of the solar system

When the four terrestrial planets of the solar system – Mercury, Venus, Earth and Mars – are placed side by side, it's clear their size distribution is close to symmetrical, with the two largest lying between the two smallest. Image: NASA.

A terrestrial planet is a small planet of high density with a solid, rocky surface. The terrestrial planets in the solar system are Mercury, Venus, Earth, and Mars. The first terrestrial planet to be found orbiting another star is OGLE-2005-BLG-390Lb.


Compare with gas giant.