NASA says an astronaut has been released from the hospital after returning from space. The unidentified NASA astronaut was briefly hospitalized for an unspecified medical issue Friday shortly after returning with three others from a nearly eight-month stay at the International Space Station.

Mysterious Circumstances After landing back on Earth, a NASA astronaut was taken to the hospital for an unidentified health issue — and there's still a lot we don't know about the situation. In an update,