Credit: SpaceNews/Jeff Foust WASHINGTON — Former NASA Administrator Bill Nelson says he is concerned about some of the recent changes at the agency, such as the firing of its chief scientist.

NASA Crew-9 astronauts Sunita Williams, Nick Hague, Butch Wilmore, and Russian cosmonaut Aleksandr Gorbunov breathed Earth's air for the first time in over nine months on Wednesday after the ...