Cleaner NASA Rover Sees Its Shadow in Martian Spring

Late afternoon lighting produced a dramatic shadow of NASA's Mars Exploration Rover Opportunity photographed by the rover's rear hazard-avoidance camera on March 20, 2014. The shadow falls across a slope called the McClure-Beverlin Escarpment on the western rim of Endeavour Crater, where Opportunity...

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Research Clarifies Health Costs of Air Pollution from Agriculture

Ammonia pollution from agricultural sources poses larger health costs than previously estimated, according to NASA-funded research. Harvard University researchers Fabien Paulot and Daniel Jacob used computer models including a NASA model of chemical reactions in the atmosphere to better represent...

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