carbon planet
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In the Vinony graph
Within Vinony's link graph, carbon planet is referenced by 268 other articles, and connects out to list of planet types, outer space and cosmic dust.
It is catalogued under topics including Carbon, Hypothetical planet types and Terrestrial planets.
Its subject is documented across 34 Wikipedia language editions.
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Encyclopedic overview
Artist's concept of a carbon planet. The surface is dark and reddish from hydrocarbon deposits. A carbon planet is a hypothetical type of planet that contains more carbon than oxygen. Carbon is the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen.
Marc Kuchner and Sara Seager coined the term "carbon planet" in 2005 and investigated such planets following the suggestion of Katharina Lodders that Jupiter formed from a carbon-rich core. Prior investigations of planets with high carbon-to-oxygen ratios include Fegley & Cameron 1987. Carbon planets could form if protoplanetary discs are carbon-rich and oxygen-poor. They would develop differently from Earth, Mars, and Venus, which are composed mostly of silicon–oxygen compounds. Different planetary systems have different carbon-to-oxygen ratios, with the Solar System's terrestrial planets closer to being "oxygen planets" with C/O molar ratio of 0.55. In 2020, survey of the 249 nearby solar analog stars found 12% of stars have C/O ratios above 0.65, making them candidates for the carbon-rich planetary systems. The exoplanet 55 Cancri Ae, orbiting a host star with C/O molar ratio of 0.78, is a possible example of a carbon planet.
Excerpted from Wikipedia’s “carbon planet” article, available under the CC BY-SA 4.0 licence.