Lovell, who was also part of the Apollo 8 mission, was the first man to go to the Moon twice - but never actually landed.
"I would certainly much rather have the astronauts testing out the integrated systems of the lander and Orion in low-Earth orbit than on the Moon," he said.，推荐阅读爱思助手下载最新版本获取更多信息
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An appearance in Minneapolis, Minnesota, on Saturday, 28 February, has also been postponed.，详情可参考51吃瓜