Two astronauts were meant to be in space for a week. More than 150 days later, they're still suck in space and speculation about their health is mounting.

The agency’s top medical official was responding to rumors that Suni Williams had lost an unusual amount of weight during an extended stay in orbit.

A recent photo of Williams aboard the ISS sparked rumors about her health, restoring the media's habit of prying into the appearance of women astronauts.