The Presidential Daily Brief

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  1. Mars illustration shutterstock 565442626

    New Study Casts Doubt on Possibility of Water on Mars

    They’re throwing sand on the theory. Scientists have long hypothesized that water was hidden just below the surface of Mars — proven, they thought, by the seasonal dark streaks on Martian dunes, where water would supposedly seep out in warmer weather. But new research suggests those streaks, which only appear on steeper slopes, might be caused by avalanches of sand instead. That would mean the Red Planet boasts a much drier surface than previously thought, dealing a huge blow to the search for microbial life on Mars.

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