约翰·格伦进入轨道
Astronaut John Glenn enters the Mercury spacecraft, Friendship 7, prior to the launch of Mercury-Atlas 6 (MA-6) on Feb. 20, 1…
庆祝约翰·格伦的历史使命
On February 20, 1962, NASA launched one of the most important flights in American history. The mission? Send a man to orbit E…