The natural world is full of mystery, but nothing captures the imagination quite like enigmatic sounds that defy explanation. From eerie hums to strange underwater noises, these anomalies leave even ...

The mystery behind a "strange noise" that a NASA astronaut heard coming from the Boeing Starliner spacecraft while aboard the International Space Station has been solved, the space agency said Monday.

Over the weekend, stranded NASA astronaut Butch Wilmore heard bewildering sounds coming out of Boeing’s much-maligned Starliner, which carried him to the space station for what was supposed to be an ...