The idea that life originated on Mars and migrated to Earth has been around for a while now, in varying degrees of seriousness. A new study supports the idea with some details.
The study notes that boron and molybdenum would have been important facilitators of the development of life, but they were rare on early Earth and abundant on Mars. It also notes that RNA, the genetic code of life before the development of DNA, doesn't do well in water, which is where Earthly life supposedly arose. RNA would have done much better in the dry land areas of Mars.
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