In Pictures: What is so infinitely cool about Mars?

Interest in exploring the Red Planet is at an all-time high -- from millionaire private space-goers to world-wide space programs and scientists

This image from the Curiosity rover shows rough spherical features on the surface of the planet in an area called 'Yellowknife Bay.' These features are interpreted as concretions, implying they formed in water that percolated through pores in the sediment. Spherical concretions have previously been discovered in other rocks on Mars, NASA said.

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