About the cover

May 2015 Volume 8 No 5

Liquid water on equatorial Mars is inconsistent with large-scale climatic conditions. Humidity and temperature measurements by the Curiosity rover support the formation of subsurface liquid brines by hydration of perchlorates during the night. The image is a colour view of a Martian dune, taken by the Curiosity rover after crossing it during the 538th Martian day, or sol, of Curiosity's mission on Mars (Feb 9, 2014).

Letter p357

IMAGE: NASA/JPL-CALTECH/MSSS

COVER DESIGN: DAVID SHAND

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