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Has Curiosity Found Fossilized Life on Mars?

There are compelling structures in a slab of sedimentary Mars rock, but their discovery alone won't prove there was ancient life on Mars.

January 6, 2015
7:00 PM EST
Overlay of sketch on photograph of Gillespie Lake to assist in the identification of the structures on the rock bed surface. | Noffke (2105)/ASTROBIOLOGY