Two Worlds, One Sun

How different does sunset appear from Mars than from Earth? For comparison, two images of our common star were taken at sunset, one from Earth and one from Mars. These images were scaled to have same angular width and featured here side-by-side. A quick inspection will reveal that the Sun appears slightly smaller from Mars than from Earth. This makes sense since Mars is 50% further from the Sun than Earth. More striking, perhaps, is that the Martian sunset is noticeably more blue near the Sun than the typically orange hues near the setting Sun from Earth. The reason for the blue hues from Mars is not fully understood, but thought to be related to forward scattering properties of Martian dust.

Two Worlds, One Sun

The terrestrial sunset was taken in 2012 March from Marseille, France, while the Martian sunset was captured in April 2015 by NASA’s robotic Curiosity rover from Gale crater on Mars.
via NASA http://ift.tt/1E34PJg

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