|Is life possible on Venus?|
What is needed for
life to exist at Venus?
What is needed for
human life to breath?
What does the atmosphere
need to be like?
|Question Date: 2005-03-03|
The answer to this question is really dependent on
how you define life. When we first started (if you
don't take God created human being) with life
evolution, we thought life could be only possible
with light, water and air (oxygen). Later on more
life forms were discovered and they didn't need
light or oxygen (anaerobic organisms). But water
is still required for the life forms we know. So
far as we know about Venus, it seems too hot to
have any of the life we know. However, we can't
rule out the possibility that there could be other
life forms exist and they might be completely
different from what we know. Therefore, there
could be life on Venus but it's may just not be
the same as we think.
I'm sure you know a
lot of Venus already. I found this website:
It looks like a good one and you can
get a lot more information from there.
need O2 to survive and that what we
breathe. In fact, the air is composed of 78%
Nitrogen and 21% oxygen. We take in both Nitrogen
and oxygen but we won't use any of the nitrogen.
The oxygen we breathe in will be exchanged with
carbon dioxide inside our body and be exhaled out
with the nitrogen. Therefore, for human being to
live, we definitely need to have oxygen in the
atmosphere. Also, as you may know, we need the
ozone to protect us from being burned by the high
energy from the sun.
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
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 Earths own
atmosphere, there are microbes in the Earths
atmosphere that independently grow and reproduce.
Actually, the conditions in the Venusian
atmosphere would be much better [for microbes]
than for Earths atmosphere.On Venus, clouds are at
31 miles (50 kilometers) altitude. Thats perfect
for a "biozone" a comfortable home for microbes
that is relatively benign. Below that height
things are too hot, and any higher theres 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.
Life as we know it is not possible on Venus. In
order for Venus to be habitable, the temperature
would need to be such that liquid water could
exist, and then water would need to be present.
The temperature on Venus is about 900 degrees C,
and even if the temperature were lowered, there
still would be no water because there is no steam
left (water gets broken up by ultraviolet
Humans need not only reasonable
temperatures and water but we also need an oxygen
atmosphere, which Venus also lacks. Having
atmospheric pressure less than 90 Earth
Atmospheres is also likely to be important (in
more ways than merely the extreme pressure
creating the extreme temperature).
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