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epa01797773 A NASA handout photo dated 20 July 1969 showing Earthrise viewed from the Apollo 11 mission's lunar orbit prior to landing. On 20 July 2009 the world marks forty years since the first human set foot on the moon. In 1961, US President John F. Kennedy had a challenge for NASA -- to land a man on the moon before the end of the decade. The first Apollo missions were spent getting ready for the moon landing. Apollo 8 and Apollo 10 even flew all the way to the moon, around it, and back to Earth. Apollo 11 traveled to the moon and arrived in lunar orbit on 19 July 1969. EPA/NASA / HO EDITORIAL USE ONLY