Two Worlds, One Sun

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Sunset: as seen from Earth and from Mars. To wit:

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 bluer near the Sun than the typically orange colours 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. The terrestrial sunset was taken in 2012 March from Marseille, France, while the Martian sunset was captured in 2015 by NASA‘s robotic Curiosity rover from Gale crater on Mars. Last week a new rover and a helicopter — onboard Mars 2020launched for Mars.

(Top left Image: Damia Bouic; Top right Image: NASA, JPL-Caltech, MSSS; Digital processing: Damia Bouic)

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One thought on “Two Worlds, One Sun

  1. Slightly Bemused

    Beautiful! A lovely set to help see what life may be like away.

    I was fascinated by Pluto Time (https://solarsystem.nasa.gov/planets/dwarf-planets/pluto/plutotime/) when New Horizons approached that planet (it will always be a planet to me!). I often wondered what the equivalent might be for the other planets, but Curiosity has shown us every day for Mars.

    Incidentally, tonight it is 9:22 pm in the Dublin region for Pluto time. At that point, it will be as bright as noon on Pluto.

    Come on ye other planets: what is your equivalent time for brightness here?

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