According to livescience.com, the sudden sound signals of radio waves to Earth from deep space are still a mystery to scientists.
For half a century, people have listened to the sounds of civilizations outside humanity, and we have captured many mysterious and unexplainable signals even today.
Scientists have recently traced the source of the mysterious signal over the past decade, in a galaxy 3 billion light-years from Earth.
It is unclear what phenomenon outside the Milky Way emits this powerful beam.