Artist conception of what a Carbon planet may look like. The surface is dark and reddish, due to all of the hydrocarbon deposits.

A Carbon planet, also sometimes called a 'diamond planet' or a carbide planet, is a theoretical type of planet that could form if protoplanetary discs are carbon-rich, and oxygen-poor. According to planetary science, these planets would develop differently from Earth, Mars and Venus, which are planets mostly made up of silicon–oxygen compounds. This theory has gained popularity.

An unconfirmed planet, discovered on August 25th, 2011, named PSR J1719-1438 b, may be a Carbon planet, as well as 55 Cancri e.

Terrestrial type planetEdit

Carbon planets would not be gas planets or giants; they would most likely have iron or steel-rich core, like the known terrestrial planets. Surrounding that would be molten silicon carbide and titanium carbide.

Possible Carbon planetsEdit

Pulsar PSR 1257+12 may possess Carbon planets that formed from the disruption of a carbon-producing star.

In August 2011, Matthew Bailes and his team of experts from Swinburne University of Technology in Australia reported that the millisecond pulsar PSR J1719-1438 may have been a binary companion star that has been crushed into a much smaller planet made largely of solid diamond.

In October 2012, it was announced that 55 Cancri e showed possible signs of being a Carbon planet. It has eight times the mass of Earth, and twice the radius.

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