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The Mars Global Surveyor, launched #NOW in 1996, was the first successful mission to the Red Planet since the Viking launches of 1975. Over its 9 years in orbit, it sent more than 240,000 images back to Earth, including this one of Mars's north pole. More: go.nasa.gov/3hcvTXx #NASAhistory nitter.net/NASAhistory/status/…

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