{"id":231240,"date":"2026-01-13T18:13:14","date_gmt":"2026-01-13T18:13:14","guid":{"rendered":"https:\/\/www.newsbeep.com\/nz\/231240\/"},"modified":"2026-01-13T18:13:14","modified_gmt":"2026-01-13T18:13:14","slug":"alone-in-space-a-chinese-astronaut-heard-a-sound-he-was-never-supposed-to-hear","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/nz\/231240\/","title":{"rendered":"Alone in space, a Chinese astronaut heard a sound he was never supposed to hear"},"content":{"rendered":"

More than twenty years ago, Yang Liwei \u2014 China\u2019s first man in space \u2014 reported hearing an eerie sound inside his capsule. The phenomenon, which seems to defy the basic laws of physics, still baffles scientists today.<\/p>\n

In the vast silence of orbit<\/a>, any unexpected noise can spark panic. That\u2019s exactly what happened in 2003, when Yang Liwei, China\u2019s first taikonaut, embarked on his historic mission. During his flight, he was startled by a strange knocking sound echoing through his spacecraft \u2014 a moment that would become one of spaceflight\u2019s enduring mysteries.<\/p>\n

\u201cIt sounded like someone hitting the hull, like striking an iron bucket with a wooden hammer,\u201d Yang later told the BBC. \u201cThe noise came from neither inside nor outside the ship,\u201d he said, unable to pinpoint its source.<\/p>\n

Determined to find an explanation, he peered out the window, looking for signs of impact or damage. Could it be a mechanical issue? A structural flaw? Or something external? Nothing seemed out of the ordinary \u2014 yet the sound continued. Over time, Yang learned to live with it, eventually calling it a \u201cnormal phenomenon.\u201d<\/p>\n

Theories from physics and engineering<\/p>\n

According to physics, Yang\u2019s experience should have been impossible. \u201cSound waves need a medium \u2014 air, water, or solid matter \u2014 to travel,\u201d explained Professor Goh Cher Hiang, a space engineering expert at the National University of Singapore, in an interview with Daily Galaxy.<\/p>\n

But in the vacuum of space<\/a>, there\u2019s no medium to carry sound. By that logic, Yang shouldn\u2019t have heard anything at all. So what really caused the noise inside his spacecraft?<\/p>\n

Scientists have suggested several possible explanations. The simplest is a physical impact. \u201cIf it was a knock, perhaps some object struck the spacecraft,\u201d said Professor Goh, though he acknowledged that the theory is speculative and nearly impossible to confirm.<\/p>\n

While orbiting hundreds of kilometers above Earth, spacecraft face constant threats from micro-debris \u2014 tiny fragments moving fast enough to pierce metal. But no sign of collision was ever found during Yang\u2019s mission.<\/p>\n

Another theory, from Professor Wee-Seng Soh, also of Singapore, points to the violent temperature shifts that spacecraft endure. \u201cIt could be the hull expanding or contracting as it moves through extreme temperature changes,\u201d he said. If true, the noise might simply be the sound of the ship\u2019s materials flexing under thermal stress.<\/p>\n

A sound shared by other astronauts<\/p>\n

Perhaps most curious of all, Yang wasn\u2019t alone. Chinese media later reported that other taikonauts on missions in 2005 and 2008 also heard the same mysterious knocking. Yang even warned future astronauts ahead of launch: \u201cDon\u2019t be alarmed if you hear it \u2014 it happened to me too.\u201d<\/p>\n

Over time, this so-called \u201cphantom knock\u201d became almost a tradition on Chinese spaceflights \u2014 no longer a cause for fear, but an accepted part of life in orbit.<\/p>\n

Still, with no solid proof, the mystery endures. It\u2019s a haunting reminder that exploration<\/a> beyond our world remains full of unanswered questions \u2014 and that even the silence of space can have its secrets.<\/p>\n

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