Link to The universe (T5): Mars the new evidence documentary
Documentary Description
In the last few years, the Red Planet has yielded up many new clues that
life may have once existed there...and may even exist there today.
There is now have proof that water once flowed on the surface, that Mars
once had lakes, and that the frozen poles are mostly water, not carbon
dioxide as previously thought. Mars has snow--an aurora--and lightning
generated by dust storms. Most intriguing of all are the seasonal plumes
of methane that just may point to bacteria living below the surface.