In this file photo from NASA, the sun sets behind the rocky terrain of Earth’s neighboring planet, Mars. The photo was taken by NASA’s Curiosity rover on April 15, 2015. The images were recorded by the Mast Camera attached to the rover. The haze in the air is martian dust still suspended in the atmosphere between dust storms. The blue hue of the image is due to the very fine dust particles being just the right size to allow blue light to penetrate the atmosphere.
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