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, 1962. The MA-6 mission was the first crewed orbital flight and Glenn became the first American to orbit the Earth during the three-orbit, five-hour MA-6 mission. Image Credit: NASA 1962年2月20日，在水星阿特拉斯6号（MA-6）发射之前，宇航员约翰·格伦进入水星飞船友谊7号。MA-6任...