There is hardly a mission in space that has passed without a single strange occurrence. Quite often we have heard confessions from astronauts about unidentified flying objects, strange phenomena, and mysterious whistling or knocking sounds in space.
The story of Yang Liwei, the first Chinese astronaut, is exactly like that, and as you can guess, there is no definite explanation.
Yang Liwei made his 21-hour space flight on October 16, 2003, aboard Shenzhou 5. Strangely, his story did not reach the public domain until 2016 during an interview with China Central Television (CCTV), in which he told about the strange noise he heard during his mission.
According to him, from time to time he heard a knock coming from nowhere. It was like someone knocking on the hull outside of the ship. And the knocking sound itself was like hitting a wooden hammer on a bucket. The knocking was irregular and appeared and disappeared unexpectedly.
According to him, he tried to see the source of this noise, but there was nothing outside. After landing back on Earth, Yang Liwei reported his misfortunes in space and even tried to recreate the exact sound he heard.
He hit metal with the help of various instruments, but never achieved the desired result and failed to reproduce the same knocking sound. He also claims to have never heard such a sound on Earth before or in the years since his mission.
Yang Liwei said that he personally warned the astronauts of the next missions about this sound – Shenzhou 6 and Shenzhou 7. As far as we know there is confirmation that they heard the same sound during their missions in 2005 and 2008, but again – no explanation was found, and the source was “invisible.”
What could be the reason for this mysterious knocking sound? Disruptions in radio communication with the Earth? Vibrations of aurora borealis? Space debris? Or do these sounds have extraterrestrial origins? The truth is that there is no grave silence in the cosmic vacuum, as most people imagine.
The cosmos is a huge orchestra, and each of its elements sounds different. With the help of special equipment, you can hear the heartbeat of the sun, the earth’s tides, how black holes make noise in the distance. It is possible that the vacuum is able to transmit a faint echo from dying stars and make it accessible to the human ear.
Of course, the version about the presence of aliens should not be rejected. Otherwise, how to explain the “voices from outside”, which from time to time are distributed in the minds of astronauts and help them during their missions. Astronauts have confessed about such “hallucinations”, which move mentally normal people to another space and time, to unknown civilizations. Astronauts do not like to be outspoken on this topic.
In any case, the problem exists and has long been the subject of targeted research.