NASA astronaut Butch Wilmore, who is currently stuck on the International Space Station (ISS), has reported some really strange noises coming from Boeing’s Starliner spacecraft. The noises are so odd that neither Wilmore nor the experts on the ground can figure out what’s causing them.

Here’s the situation: Wilmore and fellow astronaut Suni Williams arrived at the ISS in June aboard the Starliner, which was making its first crewed flight. Unfortunately, the spacecraft has run into serious trouble. It has malfunctioning thrusters and helium leaks, which means it can’t safely return to Earth. Because of this, Wilmore and Williams are stuck on the ISS until a SpaceX Dragon capsule can pick them up next year.

On Saturday, Wilmore called mission control in Texas and described a weird noise coming from the Starliner. He even held his microphone up to a speaker so mission control could hear it. The noise sounded like a repetitive, gong-like pulse, almost like a sonar ping.

Missi...