Mars rovers find signs that water flowed twice

Related: Mars

1. Headlines
   1. Astronauts to spend Memorial Day unpacking private space capsule

      Rather than kick their feet up this Memorial Day weekend, the astronauts aboard the International Space Station will be unloading cargo from the first private spacecraft ever to visit the orbiting lab.

   2. Memorial Day skywatching: See the half moon pass Mars
   3. Astronauts enter the Dragon for first time
   4. Giant radio telescope gets split location
   5. Expert doubts alien visitors would terrorize us
   6. NASA flooded with 400 ideas to explore Mars
   7. Africa's dark-sky reserve is a stargazers' heaven
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