Source: [astrobio.net]

A careful study of images taken by the NASA rover Curiosity has revealed intriguing similarities between ancient sedimentary rocks on Mars and structures shaped by microbes on Earth. The findings suggest, but do not prove, that life may have existed earlier on the Red Planet. The photos were taken as Curiosity drove through the Gillespie Lake outcrop in Yellowknife Bay.

The study was supported by the NASA Astrobiology Institute and the Exobiology & Evolutionary Biology element of the NASA Astrobiology Program.