Colonization of Venus
Venus's atmosphere is made mostly out of carbon dioxide, which, after filtering from sulfuric acid, can be used to grow food. Because nitrogen and oxygen are lighter than the carbon-dioxide that makes the atmosphere, breathable-air-filled balloons will float at a height of about . At this height, the temperature is a manageable ; or if we could get higher (see ).
Trisulfur
It occurs naturally on Io in volcanic emissions. Also is likely to appear in the atmosphere of Venus at heights of , where it is in thermal equilibrium with and . The reddish colour of Venus atmosphere at lower levels is likely to be due to .