Artist's concept depicts a supermassive black hole at the center of a galaxy. blue color here represents radiation pouring out from material very close to the black hole. The grayish structure surrounding the black hole, called a torus, is made up of gas and dust. Beyond the torus, only the old red-colored stars that make up the galaxy can be seen. There are no new stars in the galaxy. Credit: NASA/JPL-Caltech/Tim Pyle (SSC)
