JSC2011-E-034570 (11 April 2011) --- At the Cosmonautics Museum in Moscow, former Russian cosmonaut Valentina Tereshkova (left), the first woman to fly in space and former Russian cosmonaut Aleksey Leonov, the first human to walk in space, greet each other April 11, 2011 during ceremonies commemorating the 50th anniversary of the launch of Yuri Gagarin as the first human in space. Photo credit: NASA
