some scientists claim that there was life on mars. is it really true? or its all nonsense.
Its easy to get excited about the prospect of finding life on Mars—so easy that scientists have been getting worked up again and again and again and again over the past century and more. But its also easy to get too excited. NASA, for one, has learned from experience that announcing evidence even for long-extinct life on the Red Planet is a risky business, since its so easy to be wrong.
Thats why the agency is being so careful about a suite of reports from the Mars Science Laboratory (MSL), better known as the Curiosity rover, which has been sniffing around the Red Planet since its August, 2012 landing. The six papers, just published in Science, make no claim that theyve found even the slightest evidence of life.
But what they have found is hugely important nonetheless: convincing evidence of a lake that rippled on the Martian surface some 3.6 billion years ago and that would have provided a fertile habitat for bacterial life—assuming the bacteria were actually there. This environment would have been almost earthlike, says Caltech planetary scientist and MSL project scientist John Grotzinger, in terms of geochemistry and in the presence of water.