Fifteen years ago, a group of NASA scientists studying the Mars meteor fragment ALH84001 said they had found evidence of life on early Mars. That conclusion has been contested ever since. Now, another group of scientists say ALH84001 holds evidence of a warmer, wetter Mars in the past.
The current group is being careful to say their conclusion says nothing at all about the possibility of life on Mars, nor about the overall climate of early Mars.
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