The Mars rover InSight will not launch as scheduled in March. A seismometer it was supposed to carry has experienced a series of vacuum leaks and cannot be repaired in time. Yang Lei/Xinhua/Landov hide caption

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Cocoa pods in Ivory Coast, one of the world's top producers of cocoa. Climate models suggest that West Africa, where much of the world's cocoa is grown, will get drier, which could affect supply. Issouf Sanogo/AFP/Getty Images hide caption

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An illustration shows what a helicopter drone would look like on the surface of Mars. NASA/JPL-Caltech hide caption

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The grooves on Mars' moon Phobos could be produced by tidal forces – the mutual gravitational pull of the planet and the moon, says NASA. The theory is the latest explanation for grooves that were once thought to result from the massive impact that caused the Stickney crater (lower right). NASA/JPL-Caltech/University of Arizona hide caption

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Solar storms from the sun send charged particles streaming towards Mars. Research now shows those particles are stripping away the atmosphere. NASA/GSFC hide caption

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The Two-Way

Researchers Reveal How Climate Change Killed Mars

Mars used to be much warmer and wetter than it is today. Scientists are unraveling the mystery of why it dried out.

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Matt Damon portrays an astronaut who relies on science to survive on a hostile planet. Giles Keyte/EPKTV hide caption

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For several years, a satellite orbiting Mars has seen streaks flowing from Martian mountains during warm periods on the surface. Scientists have now confirmed that water is involved. NASA/JPL/University of Arizona hide caption

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Mars, anyone? Six researchers from the Mars Society sport their best space duds during this 2014 simulation of the conditions that explorers of the Red Planet might face. (From left) Ian Silversides, Anastasiya Stepanova, Alexandre Mangeot and Claude-Michel Laroche. Micke Sebastien/Paris Match via Getty Images hide caption

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