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 ).
Venus Atmospheric Maneuverable Platform
Since some models suggest Venus once had a habitable climate with liquid water on its surface for as long as 2 billion years, it is speculated by some scientists that these absorption features could be caused by large masses of microorganisms suspended in the lower cloud layer, and hypothetically thrive on iron- and sulfur-centered metabolism. On Earth, some extremophile bacteria can thrive in very acidic conditions, can feed on carbon dioxide, and excrete sulfuric acid.