NASA astronauts are returning to Earth after nine months in space. Experts have said a prolonged period in space can come with changes to human physiology and psychology.

White House-led talks on the future of TikTok are coalescing around a plan for the biggest non-Chinese investors in parent company ByteDance to up their stakes and acquire the short video app's U.S. operations, according to two sources familiar with the discussions.

Butch Wilmore and Suni Williams left the International Space Station after nine months in space, checking out with two other astronauts. Their SpaceX capsule parachuted into the Gulf of Mexico in the early evening,