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In the "Viking" program, NASA sent two space probes (Viking 1 and 2) to Mars. The Viking 1 space probe launched on August 20, 1975 in Cape Canaveral for Mars. The spacecraft entered orbit on June 19, 1976. On July 20, 1976, it landed on an extensive plain on the planet Mars. At six years and 116 days, this mission was the longest of its time. The record was broken in 2010 with the "Rover Opportunity".