New (and very special) sonification of actual sound waves in the Perseus galaxy cluster! In 2003, sound waves were detected in x-ray images of the hot gas surrounding the cluster. Their pitch is a Bb, about 57 octaves below middle C making them the lowest frequency sound waves ever discovered. We have extracted the waves from the image and re-synthesized them, bringing them into human hearing range. To make them clearly audible, we have increased their true pitch by 57 and 58 octaves (144/288 quadrillion times their true frequency). The waves are triggered by a central black hole and propagate outwards. In this radar-like scan (clockwise, starting at 12 o'clock) you can hear the waves that were emitted in different directions. They are strongest around 2 and 11 o'clock. Other sounds present are due to density variations in the gas that are not associated with sound waves (i.e. not pressure waves). We'll explain more about how it works on our website very soon. This was produced in collaboration with @nasachandraxray and @nasa’s Universe of Learning #sonification #astronomy #blackhole #blackholeweek #fouriertransform