Composition Carbon planet
comparison of sizes of planets different compositions
carbon planets predicted of similar diameter silicate , water planets of same mass, potentially making them difficult distinguish. equivalents of geologic features on earth may present, different compositions. instance, rivers might consist of oils. if temperature low enough (below 350 k), gasses may able photochemically synthesize long-chain hydrocarbons, rain down onto surface.
nasa cancelled in 2011 mission, called tpf, observatory bigger hubble space telescope have been able detect such planets. spectra of carbon planets lack water, show presence of carbonaceous substances, such carbon monoxide.
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