Summary: NASA’s Hubble and Chandra telescopes have identified a rare intermediate-mass black hole in galaxy NGC 6099, bridging the gap between stellar and supermassive black holes. These elusive objects are a missing link in our understanding of how black holes grow and evolve. By combining X-ray and optical data, astronomers found evidence of a dense star cluster and high-energy emissions, pointing to a black hole that helps complete the black hole family tree.