Four astronauts will return from the International Space Station more than a month ahead of schedule after an unnamed crew member experienced a medical issue.

NASA has revealed the return date for four International Space Station (ISS) crew members who are being evacuated from the station after one fell ill with an unknown condition.

NASA’s chief health and medical officer, James “JD” Polk, said the affected astronaut is “absolutely stable” and that this isn’t a case of an emergency evacuation.