Maybe even pained, if you listen carefully enough.
A galaxy cluster has so much gas that we’ve picked up actual sound.
Decades ago, astronomers discovered Perseus' void-like interior sends out pressure waves.
Because space is a vacuum, there isn’t any medium for sound waves to travel through.
This is why space is often considered totally quiet.
But the silence isn’t because cosmic objects aren’tmakingsounds.
Their waves just don’t have anything to vibrate.
Itcancreate sound wave vibrations, and those are the hot gas ripples scientists are focused on.
And, as an added bonus, NASA also released another, much less ominous, black hole sonification.
Together, they make a bittersweet symphony.
