“NASA has turned real black hole data into sound you can hear. They took pressure waves from the Perseus galaxy cluster—tiny ripples in hot gas—and shifted them up by over fifty‑odd octaves, so we can actually listen. They did the same for the famous black hole in M87, using X‑rays, optical, and radio light to create different tones. #blackhole #space #astronomy #NASA #spacefacts #SpaceExploration #Universe | Nikola Sagan