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By the early 2020s more than 500 people, coming from more than 40 different countries and more than 10 percent of whom were women, had flown in space. As of that same time, only Russia, China, and the United States had the capability of carrying out human spaceflights. With the retirement of the space shuttle in 2011, the United States lost its independent human spaceflight capability. Such capability was not regained until 2020, when a new private commercial spacecraft, SpaceX’s Crew Dragon, was ready for use. Human spaceflight is both risky and expensive. From the crash landing of the first ...(100 of 22189 words)