A growing black hole, called a quasar, can be seen at the center of a faraway galaxy in this artist's concept. Using NASA's Spitzer and Chandra Space Telescopes, astronomers discovered swarms of similar quasars hiding in dusty galaxies in the distant universe. The new-found quasars belong to a long-lost population that had been theorized to be buried inside dusty, distant galaxies, but were never actually seen. Scientists uncovered many of these lost quasars in the bellies of massive galaxies between 9 and 11 billion light-years away.
Image Credit: NASA/JPL-Caltech