India, Jan. 9 -- 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 not provided details about the nature of the problem, citing privacy concerns. The agency typically does not discuss the specifics of health matters related to astronauts.

The four astronauts on NASA-SpaceX Crew 11 - U.S. members Mike Fincke and Zena Cardman, along with Japan's Kimiya Yui and Russia's Oleg Platonov - are expected to return within the coming days to one of the routine splashdown sites.The astronauts have been on their mission since August 1. Such journeys generally last approximately six months, and this crew was already scheduled to return ...