Why do most scientist do not believe that there is life on Mars ?

Answer 1

It is interesting that for much of the 20th century many people (including many scientists) thought there was life on Mars. In particular, seasonal changes in the dark and light patches on Mars were interpreted as vegetation changes. Check out William Sheehan's book "The Planet Mars: A History of Observation and Discovery" which can be accessed on the Web.

However spacecraft showed the planet to be very barren and covered with many craters. Liquid water does not last long on the surface before it volatilizes or freezes. The type of life we know about needs liquid water. Another thing about the life we know of is that it is based on carbon atoms. Carbon (particularly in combination with hydrogen, oxygen and nitrogen) can produce a bewildering array of chemicals. An experiment on the Viking Landers failed to detect any sign of such organic chemicals. Another experiment seemed to indicate biological activity through the consumption of radio-actively labelled organic chemicals. There are some who maintain that this is still indicative of life, others maintain that the results were caused by a non-biological chemical reaction with something or things in the soil.

Answer 2

Well lets say that life as we know it must have water to survive. What about life that has formed without the use of water? Unfortunately no one can answer this question, yet.

Many scientist think that life COULD have formed on Mars, but it is possible that it is extinct today or hidden deep underground. Mars is the perfect place for life to have formed, water, lots of CO2. The only thing is, how long has Mars been considered a 'dead planet'?

I believe that evidence will be found that life is still on Mars, or at least life had existed there at one time. Until we get a manned mission to explore the surface and start looking hard, we may never know. There are places on Earth where scientist believed that life could not survive and it has. Deep sea trenches, boiling water of the Mid-Atlantic ridge, salt flats where it only rains once every two or three years.

Life is incredibly adaptive and will struggle to survive once given a chance.

Answer 3

Scientist believe that there is no life there because in my further research, no one has yet seen life in the deserted planet and its atmosphere is so extremes that some times it is so cold or hot. Though specimens found some things that may prove that there is water there, some still not believe that life could have survives there.

Answer 4

While water has been found on Mars in the form of large underground frozen lakes; the extremes of temperatures, carbon dioxide atmosphere, amd exposure to cosmic rays and uv rays from the sun make the possibilities quite remote.

Answer 5

They say that mars was like our earth billions of years ago but no one really knows.There is water at its poles,but it's frozen.Life on the other hand is uncertain.Scientist have found some evidence of life but it isn't sufficient.National

Answer 6

For a scientist to answer a question he must have proof.
There is not yet any proof of life on Mars.
That is why we are there; looking for proof.

Answer 7

Because we haven't seen any. The Viking probes searched for sings of life, but didn't find any. There is, as of yet, no concrete evidence that any sort of life exists, and very concrete evidence that no advanced life exists. There may have been some befroe- there is evidence that water used to flow on it.

Answer 8

coz they cant find the main sources of life on mars ,like water ,etc

Answer 9

they know that Life as we know it couldn't exist. Whether there may be other forms of life,only time will tell

Answer 10

WATER IS MUST FOR ANY LIFE TO SUSTAIN , ALSO THE ATMOSPHERE SHOULD CONTAIN O2&CO2