File:Phosphorusplanet.jpg

English: Phosphorus planet is a hypothetical class of planet with surface covered in lakes or oceans of phosphoric acid with clouds made of phosphoric acid in the atmosphere. Kepler-55c is speculated to be a phosphorus planet.Viewed from space, phosphorus planet would appear white or reddish, just like phosphorus itself. Phosphorus planets' main climates are precipitation and "white fog." Unlike Earth, phosphorus planets would use phosphoric acid as a "variable gas" instead of water vapor as it is on Earth. For example, there are phosphoric acid rain or phosphoric acid snow instead of water rain or water snow. Those planets would tend to be hot, at around 340°F (171°C). Their atmospheres would tend to be composed mostly of phosphorus trioxide (P4O6) with variable amounts of phosphoric acid vapor (H3PO4) and trace amounts of phosphorus trichloride (PCl3), phosphine (PH3), carbon dioxide (CO2), and other gases.The life-bearing status on phosphorus planets are fair, even though phosphorus is toxic to many forms of life on Earth. Sme forms of life may require phosphorus in the form of compounds to thrive. It is predicted that during a photosynthesis-like process, phosphoric acid (H3PO4) and phosphine (PH3) may combine with carbon dioxide (CO2) to produce triphenylphosphate (OP(OC2H5)3), phosphorus trioxide (P4O6), and oxygen (O2).It is also predicted that animal-like life may drink phosphoric acid and eat foods rich in organophosphates. Like terrestrial animals, they would inhale oxygen and exhale carbon dioxide on phosphorus planets. The main biogeochemical cycle on phosphorus planets would be the phosphorus cycle compared to the carbon cycle here on Earth.