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English: Sulfur planet is a theoretical class of planet with surface covered in lakes or oceans of sulfuric acid with sulfuric acid clouds in the atmosphere. Kepler-52c, Kepler-47b, Tau Ceti e, and KIC 5522786 b are speculated sulfur planets as of 2014. Venus has sulfuric acid clouds in the atmosphere, but Venus is not considered a sulfur planet because there is not quite enough sulfur on its surface. Instead, much of the surface is covered in solidified lava.Viewed from space, sulfur planet would appear yellow, just like the element sulfur itself. However, the color of clouds can be slightly different depending on their chemistry of condensation nuclei.Sulfur planets may tend to have similar climates to Earth's, except they use sulfuric acid as a "variable gas" instead of water vapor as it is on Earth. For example, there may be sulfuric acid rain or sulfuric acid snow instead of water rain or water snow. Those planets are predicted to be warmer than Earth, at around 150°F (66°C). Their atmospheres probably tend to be composed mostly of nitrogen and oxygen with variable amounts of sulfuric acid and trace amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide, and other gases.The life-bearing status on sulfur planets are good. Life on sulfur planets is similar to Earth except they use sulfuric acid as a solvent, whereas life on Earth use water as a solvent. Many plant-like life on sulfur planet may use photosynthesis using light from the parent star. It is predicted that plant-like life may use sulfuric acid and carbon dioxide to produce thioacetic acid, sulfur dioxide, and oxygen.It is also predicted that animal-like life on this environment should inhale oxygen and exhale carbon dioxide like animals do on Earth. Animals may be able to drink sulfuric acid instead of water, and they may be able to eat sulfur-rich foods. The main biogeochemical cycle on sulfur planets is the sulfur cycle compared to the carbon cycle here on Earth.