A few days before the photo of the black hole of the Milky Way that went around the world, a remix from NASA made a duet the voices of two other black holes: the one at the center of the cluster of galaxies of Perseus and that of the galaxy Messier 87 The researchers, in fact, have succeeded in translating into sounds the data collected by both space and Earth-based telescopes, relating to the pressure waves emitted and the light radiation, also bringing them to frequencies audible to humans.
The black hole in the Perseus cluster has been associated with sound waves since 2003, when researchers discovered that the pressure waves emitted caused ripples in the hot gas of galaxies, which in turn produced sounds at frequencies impossible for the planet to perceive. human ear.
Now for the first time NASA makes those data, captured by its orbiting Chandra telescope, audible: the sound waves have been extracted in a radial direction (from the center towards the outside), allowing you to listen to the 'notes' emitted in the various directions, and their original frequency has been raised hundreds of millions of billions of times to make them audible.
For the black hole of the Galaxy Messier 87, on the other hand, the data collected by Chandra in X-rays, by the Hubble Space Telescope of NASA in optical light and by the Alma telescope (in Chile) of the Southern European Observatory (Eso) were 'remixed'. in radio waves (the three frequencies in the video appear in order from bottom to top).
Different tones have been assigned to each wavelength, from the lowest to the highest, in order to create a sort of symphony: the first most intense part corresponds to the point where the black hole was identified (the brightest part on the left of the image), while the music fades as you move away following the jet of matter that falls engulfed.
