It is not actual evidence of life, but evidence that points to life. It may take a while to get back and verify, but space if it is confirmed space could soon be a much more crowded place then we previously thought.
"A special mission to the Red Planet has revealed the likely presence of a form of pond scum - the building blocks of life as we know it.
NASA unveiled the results of the recent Opportunity and Spirit probes sent millions of miles through the solar system to discover signs of extraterrestrial life.
The results are so promising boffins have already planned a host of other missions to discover whether there is extraterrestrial life in the universe.
But the NASA boffins said the recent missions have gone further than any others in proving there is life on Mars.
They were particularly excited about the discovery of a sulphate called gypsum which, it has emerged recently, is found in large quantities among fossils in the Mediterranean.
Jack Farmer, researcher at the Arizona State University, in Tempe, Arizona, said he was "optimistic" there was - or had been - life on Mars.
Another of the scientists Bill Schopf, researcher at the University of California in Los Angeles, added: "One, thanks to Opportunity and the rovers and orbital imaging it is clear that there are literally vast areas of Mars that are carpeted with various sorts of sulphates, including gypsum."