Tag Archives: earth

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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An animation showing the 1.255 light second distance between us and the moon (the Sun is about 8 light minutes from us) created by planetary scientist Dr. James O’Donoghue using NASA imagery. and that’s not all. To wit:

This is the distance between the Earth and Moon with the correct sizes and scales. The real-time speed of light is also shown.

(Image: ‘Moonrise over Earth’ by Detlev Van Ravenswaay)

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Acrylic paintings by artist Josh Keyes who sez:

Who is to say what surface is to be kept graffiti clean? My personal concern is that this will be a reality some day and speaks to a larger issue of our relationship with the natural world. The satellite and space graffiti hints that even if we colonize other worlds, what mark will we leave? No matter where we go there is evidence of our presence.

Fair enough.

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