NASA is celebrating the first successful landing on Mars by a U.S. spacecraft – Viking 1 -- with a history discussion from 2 to 3:30 p.m. EDT Tuesday, July 19, and a Viking 40th anniversary symposium 8 a.m. to 5:10 p.m. Wednesday, July 20 at NASA’s Langley Research Center in Hampton, Virginia.
July 07, 2016
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