The more I think about it, the more I doubt that life has existed or does exist on Mars. I say this, becaues if there is/was life there, then why havn't we found clear evidence of it yet.
With each day that passes I think that the chances of finding it are decreasing. Surely, with 2 rovers, and countless other experiments in orbit at this present time we would have found clear evidence by now.
I'd like to be proved wrong one day in the not too distant future, as I think this discovery needs to be made soon, if not on mars then elswhere.
Maybe it is that mars microbes are buried under the surface and we will only find out for sure if/when we take humans there?
It just seems like with the intensity that we are studying this planet, we should have found clear evidence by now if it is there.