嗨,瑞奇:这周是教师感谢周!
Astronaut Ricky Arnold is shown on his first spacewalk as a crewmember on STS-119. Before he joined the Astronaut Corps, Arnold was a teacher in classrooms all over the world, from Malaysia to Romania. Arnold also served aboard the International Space Station on Expedition 55/56. In this image, during the six-hour, seven-minute spacewalk, Arnold and fellow a...