New Black Hole Theory Could Overthrow Einstein's Theory of Gravity Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email A growing black hole, called a quasar, can be seen at the center of a faraway galaxy in this artist's concept. NASA telescopes discovered similar quasars hiding in galaxies in the distant universe. ( NASA / Wikimedia Commons ) Produced by Kristen Meinzer Hosted by Manoush Zomorodi Produced by PRI and WNYC