55 Cancri Ae
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55 Cancri Ae, officially named Janssen, is an exoplanet orbiting a Sun-like host star, 55 Cancri A. The mass of the exoplanet is about eight Earth masses and its diameter is about twice that of the Ea
Artist's impression of 55 Cancri Ae as a lava planet
Artist's impression of 55 Cancri Ae with a thick atmosphere
Carbon planet
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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.
55 Cancri Ae
…The planet's thermal emission is observed to be variable, possibly as a result of volcanic activity. It has been proposed that 55 Cancri Ae could be a carbon planet. The atmosphere of 55 Cancri Ae has been extensively studied, with varying results. Initial studies suggested an atmosphere rich in hydrogen and helium…
Artist's concept of a carbon planet. The surface is dark and reddish from hydrocarbon deposits.
PDS 70
HST SWEEPS Detail 2006