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Originally posted by epsilon69
Reasons why there can be no life on Mars
1. It's to cold.
2. Lack of Atmospheric pressure.
3. Cosmic rays and solar radiation constantly sterilize the surface (UV light breaks molecules apart).
4. Lack of liquid water (due to reason 2).
5. To far from the sun meaning a lack of solar energy even if plant DNA could survive the onslaught of radiation.
So if we take all of these bullet points into account we can assume that Mars is devoid of any surface life as we know it, now the hard part is people coming to terms with this.
Clouds have been observed on Mars since quite a while before Phoenix. In 1997 Pathfinder returned many images of a variety of clouds. mars.jpl.nasa.gov... In 2008 Phoenix also observed snow falling from those clouds but the snow did not reach the surface.
The presence of water on Mars has been established since the 1960s (at least). It is the presence of liquid water which is open to debate.
The atmospheric pressure is too low to allow it to last for long before evaporating and turning into...clouds of ice high in the atmosphere. The atmospheric pressure is so low that the falling snow evaporated without ever melting (sublimated).
Originally posted by epsilon69
Reasons why there can be no life on Mars
1. It's to cold.
2. Lack of Atmospheric pressure.
3. Cosmic rays and solar radiation constantly sterilize the surface (UV light breaks molecules apart).
4. Lack of liquid water (due to reason 2).
5. To far from the sun meaning a lack of solar energy even if plant DNA could survive the onslaught of radiation.
So if we take all of these bullet points into account we can assume that Mars is devoid of any surface life as we know it, now the hard part is people coming to terms with this.