55 Cancri e

55 Cancri e is an exoplanet orbiting in the 55 Cancri system 41 light years from Earth.

Properties
55 Cancri e was thought to be made of diamond, reflected from data of the high amount of Carbon in its host star. This theory was later challenged. 55 Cancri e also orbit very close to its host star, making it hot enough to melt metals.

55 Cancri e was first thought to be a gas dwarf, but later a Super-Earth. It is suspected to have volcanoes, do to certain light curves An atmosphere of hydrogen and helium has been detected around the planet.