Skip to content


Definition: These planets lie between about 2 times and 10 times the mass of Earth.

Their composition may be dominated by water or they may be large bodies composed by rocks covered in an envelope of hydrogen and helium, depending on the planet in question. In many cases, the composition can not be determined from measuring mass and radius alone.

Some Super-Earths, particularly those that are more massive and have a lower density, are sometimes also called mini-Neptune and there is no clear and universally accepted distinction between these terms.

There is no analogue to this class of planet in the Solar System.

Example: CoRoT-7 b, a planet five times as heavy as Earth, orbiting its star within less than a day.

Artist’s impression of CoRot-7 b. Credit: ESO/L. Calçada

back to the outreach page

To top