Let's Hear The Sound Of A Black Hole

Q. Since sound can not travel through space then how we can hear the sound of black hole? 

Many people think that sound can not travel through space but actually it can. Let me explain you, most of space is a vacuum, with no medium for sound waves to travel through but a galaxy cluster has large amounts of gas that envelop the hundreds or even thousands of galaxies within it and due to presence of this medium sound of black hole can travel through them.

Lets see the tweet and the video.

The misconception that there is no sound in space originates because most space is a ~vacuum, providing no way for sound waves to travel. A galaxy cluster has so much gas that we've picked up actual sound. Here it's amplified, and mixed with other data, to hear a black hole! pic.twitter.com/RobcZs7F9e

— NASA Exoplanets (@NASAExoplanets) August 21, 2022

This galaxy cluster we hear is "Perseus", this data comes from NASA's Chandra X-ray Observatory, it was released in May for NASA's Black Hole Week. As NASA explained it back then, "Astronomers discovered that pressure waves sent out by the black hole caused ripples in the cluster’s hot gas that could be translated into a note — one that humans cannot hear some 57 octaves below middle C."