Some scientists think that there is some reason to believe Venus may have been the best haven for
life in the early solar system. But having 900
degree Fahrenheit surface temperatures and an
atmosphere permeated by carbon dioxide, chlorine
and sulfuric acid clouds today, Venus seems
inhospitable to "our kind of life." Then we can say that life as we conceive it, can not exist in Venus.
The assertion that microbial life
may exist in the Venusian atmosphere is based on
the assumption that microbial life originated in
an early Venusian ocean, or was brought in by
meteorites from Earth or Mars. Life then adapted
to the atmospheric niche when Venus lost its
To bolster the case for life on Venus, one needs to first look at Earth's own
atmosphere; there are microbes in the Earth's
atmosphere that independently grow and reproduce.
Actually, the conditions in the Venusian
atmosphere would be much better [for microbes]
than Earth's atmosphere.
On Venus, clouds are at 31 miles (50 kilometers) altitude. That's perfect for a "biozone" a comfortable home for microbes
that is relatively benign. Below that height
things are too hot, and any higher there's too much ultraviolet radiation and zapping from cosmic
rays. These conditions make "our kind of life"
In order for human life to breath, Nitrogen (79% of air), and Oxygen (20% of air) are needed in the atmosphere. The pressure and the temperature are also important for "our kind of life". The average temperature of the
atmosphere at the surface of the earth is 57.2
Fahrenheit degrees, and the average atmospheric
pressure at sea level is about 14.7 pounds per
square inch. The atmospheric pressure is a direct
result of the weight of the air.