PHOENIX — An unspecified “medical concern” involving one of the astronauts aboard the International Space Station has postponed a spacewalk and could force an unprecedented early return of part of the crew.
NASA announced Jan. 7…
PHOENIX — An unspecified “medical concern” involving one of the astronauts aboard the International Space Station has postponed a spacewalk and could force an unprecedented early return of part of the crew.
NASA announced Jan. 7…