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Visitors explore an interactive map of the surface of Mars at the Smithsonian Institution’s National Air and Space Museum Mars Day, an annual event celebrating the Red Planet with exhibits, speakers, and educational activities, Friday, July 21, 2017 in Washington. Photo Credit: (NASA/Aubrey Gemignani) — NASA HQ · 2017. ABD devlet eseri: kamu mali, ticari islerde de serbestce kullanilabilir.
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