Space theorist posits unusual life on Mars ‘2nd genesis’ on Red Planet San Francisco Chronicle

The planet Mars may well have been the scene of the solar system’s “second genesis,” where forms of life vastly different from Earth’s emerged deep beneath the Martian surface billions of years ago, a leading space scientist proposed Wednesday. Christopher McKay, of NASA Ames Research Center in Mountain View, said that life on early Mars might have been based on DNA, genes and proteins unlike anything found on Earth.