NASA Explains Strange Noises Heard on Boeing Starliner

The spacecraft is scheduled to autonomously undock from the ISS no earlier than Friday, making way for a SpaceX Dragon spacecraft carrying NASA’s two-person Crew-9 astronaut rotation mission. Wilmore and Williams will hitch a ride home on that Dragon, rather than Starliner, after NASA determined the beleaguered Boeing spacecraft poses too much risk to return with crew as planned.

The space agency on Monday said the strange sounds have ceased and will have “no technical impact to the crew, Starliner, or station operations, including Starliner’s uncrewed undocking from the station.”

According to a conversation picked up by a Michigan-based meteorologist and first reported by Ars Technica, Wilmore on Saturday radioed NASA mission control at Johnson Space Center in Houston to report the odd sound.

“Got a question about Starliner,” he said. “There’s a strange noise coming through the speaker…I don’t know what’s making it.”

The astronaut asked mission control to listen in and see if it could determine the source of the noise. Moments later, Houston called back and Wilmore, now inside Starliner, held his microphone up to the spacecraft’s speakers, picking up the unusual sound.

“All right, Butch, that one came through,” mission control said. “It was kind of like a pulsing noise, almost like a sonar ping.”

The operator confirmed with Wilmore that there were no “other weird noises” coming from Starliner.

“I’ll do it one more time and let y’all scratch your heads and see if you can figure out what’s going on,” Wilmore replied, capturing the sound again. “Call us if you figure it out.”

Retired Canadian astronaut Chris Hadfield, who flew two space shuttle missions and served a stint as ISS commander, had an ominous response to the noise in a post on X.

“There are several noises I'd prefer not to hear inside my spaceship, including this one that @Boeing Starliner is now making,” Hadfield said.

NASA, though, offered a more mundane explanation for the pulsing sound.

“The feedback from the speaker was the result of an audio configuration between the space station and Starliner,” the space agency said. “The space station audio system is complex, allowing multiple spacecraft and modules to be interconnected, and it is common to experience noise and feedback. The crew is asked to contact mission control when they hear sounds originating in the comm system.”

This wouldn’t be the first time astronauts have encountered unusual noises in space. In 1969, for example, Apollo 10 astronauts reported hearing strange whistling “music” as they circled the moon. Apollo 11 pilot Michael Collins said he heard a similar “woo-woo sound” during his mission, which engineers have chalked up to radio interference.

More recently, Yang Liwei, the first Chinese man to reach space in 2003, recalled hearing what sounded like “someone knocking the body of the spaceship just as knocking an iron bucket with a wooden hammer.” Scientists now believe it was the result of air pressure changes.

It appears the noise heard aboard Starliner likewise has a rational explanation. Regardless, Wilmore and Williams will not need to concern themselves with it, as they are set to ride SpaceX’s Dragon back to Earth. The astronauts will return in February, eight months after they arrived at the space station.

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