Chandra Wickramasinghe, an astrobiologist at Cardiff University in the United Kingdom, and his team say their calculations show that it is one trillion times more likely that life started inside a comet than on Earth. That's quite a lot if you ask me. They must be pretty sure.
"The comets and the warm watery clay pools in comets are settings in which the organic molecules are transformed into living structures in comets," Wickramasinghe said. "That transformation is more likely in some comet somewhere in the galaxy than in any small pond on the Earth." Watch a video here
The way I see it, it's a lot of speculation, because there isn't much proof yet. On the other hand...didn't people get hung in the past for believing the earth was round?
Glad those days are over.