55 Cancri e

55 Cancri e is a superterran exoplanet made almost entirely of carbon, giving it the nickname the "diamond planet" or "Lucy" (from the Beatles song "Lucy in the sky with diamonds"). The planet orbits a sun like star just 2,400,000 kilometres from the star on average, pushing surface temperatures to an average of 2,575°K. The gravity of 55 Cancri e is around 15 times that of Earth, and the planet is tidally locked. The likelihood of diamonds on 55 Cancri e is due to the insane pressures on the planet.55 Cancri E is also known of being up to double the size of Earth.