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Alone in Space, Astronaut Hears Terrifying Unexplained Knock—What Really Happened?

In 2003, during his maiden spaceflight, China’s first astronaut,Yang Liwei, encountered a strange and unsettling phenomenon: a mysterious knocking sound. As he navigated the vast emptiness of space, ...
BGR

A Chinese Astronaut Heard A Sound In Space That Hasn't Been Explained In Two Decades

Space horror is a part of our popular culture. An episode of "Doctor Who" called "Listen," featuring Peter Capaldi in the titular role, saw the Doctor investigate a supposed creature that can never ...
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China’s First Astronaut Heard Knocking In Space Like Someone Was Outside, Experts Still Baffled

In 2003, Yang Liwei, the first Chinese astronaut to travel to space, reported hearing a strange, unexplained knocking sound while orbiting Earth aboard China’s Shenzhou 5 spacecraft. The event was ...
Ars Technica

Subwoofer making a constant knocking sound when not in use

I've got a 6 year old JBL 10" subwoofer (home theater sub, not a sub for a car) that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver. The sound is ...