The health issue affecting an astronaut aboard the International Space Station (ISS) may be serious enough to end his or her orbital stay early.
On Wednesday afternoon (Jan. 7), NASA announced that it has postponed a planned Thursday (Jan. 8) spacewalk outside the ISS due to an astronaut "medical concern." The agency did not name the astronaut or share details about his or her condition, citing privacy issues, but did note that the situation is stable.
