evidence: Earlier this month, NASA released the first recordings, or sonifications, of what two black holes sound like—and it’s just the kind of noise astronomers and science fiction buffs were expecting: eerie, ethereal, and aurally extraordinary. The universe is rife with the hum of celestial melodies—but it’s only relatively recently that humans have developed the technology to be able to hear them. A team of scientists at NASA’s Chandra X-ray Observatory were able to extract and make audible previously identified sound waves from a nearly 20-year-old image of the Perseus galaxy cluster—a collection so full of galaxies, it’s assumed to be one of the most massive objects in the universe. It’s one of the closest clusters to Earth, around 240 light-years away. [...] After scientists discovered that the star Trappist-1 was the most musical solar system in 2017, Russo went on to co-found SYSTEM Sounds, an outreach project that translates the rhythm of the universe into beautiful, unearthly tones that expresses both sonic data and artistic pieces. The project has since produced regular sonifications in collaboration with NASA, and Russo himself has helped create many of the pieces featured in an entire album that utilized Chandra’s observations, called A Universe of Sound.