#1. New Signs of Long-Gone Life on Mars
In record time, the Curiosity rover has accomplished its main goal: determining whether the Red Planet was once habitable. The answer is a resounding "yes."
An ancient dry streambed indicated the presence of water, and X-ray spectroscopy revealed key chemical ingredients for life in the bedrock.
In addition to looking at signs from the past, the rover is also informing the future. Radiation measurements taken en route to the planet will help engineers one day design a manned mission to Mars.
And you'd better believe that will be Discover's #1 story when it happens.
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