In a remarkable article in the Scientific American, Paul Davies reports on scientists’ pursuit of evidence that life arose on Earth more than once, providing evidence for a plethora of life in the universe.
“The origin of life is one of the great unsolved problems of science,” writes Davies. “Nobody knows how, where or when life originated. About all that is known for certain is that microbial life had established itself on Earth by about three and a half billion years ago. In the absence of hard evidence of what came before, there is plenty of scope for disagreement.”
And a plethora of disagreement there is.
