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People participate in an activity to celebrate Yuri Gargarin's 82nd birthday in St. Petersburg, Russia, on March 9, 2016. The late cosmonaut Yuri Gagarin became the first person in space on April 12, 1961 and was killed in 1968 at age of 34 in a plane crash. He sould have been 82 years old on Wednesday.(Xinhua)

People hold red balloons with the name of Yuri Gargarin during an activity to celebrate Yuri Gargarin's 82nd birthday in St. Petersburg, Russia, on March 9, 2016. The late cosmonaut Yuri Gagarin became the first person in space on April 12, 1961 and was killed in 1968 at age of 34 in a plane crash. He sould have been 82 years old on Wednesday. (Xinhua)

A mini-rocket lifts off during an activity to celebrate Yuri Gargarin's 82nd birthday in St. Petersburg, Russia, on March 9, 2016. The late cosmonaut Yuri Gagarin became the first person in space on April 12, 1961 and was killed in 1968 at age of 34 in a plane crash. He sould have been 82 years old on Wednesday. (Xinhua)

People participate in an activity to celebrate Yuri Gargarin's 82nd birthday in St. Petersburg, Russia, on March 9, 2016. The late cosmonaut Yuri Gagarin became the first person in space on April 12, 1961 and was killed in 1968 at age of 34 in a plane crash. He sould have been 82 years old on Wednesday. (Xinhua)