Space.com on MSN8 天
How NASA's Starliner mission went from 10 days to 9 months: A timeline
Wilmore and Williams, both former U.S. Navy test pilots, expected to remain in orbit for about 10 days on the mission, which ...
PBS3 个月
russian space history
Third-Generation Station: Mir (1986-present) Mir was the first permanent space station. The station has been in orbit for 13 years, and staffed continuously for the past 9 years. The complex ...