... A Quasar Portrait Gallery . ... Wales ), NASA Explanation: QUASARs (QUASi-stellAR objects) lie near the edge of the observable Universe . ... Many believe the quasar's central engine is a giant black hole fueled by tremendous amounts of infalling gas, dust, and stars. ... The images in the center and right hand columns reveal quasars associated with disrupted colliding and merging galaxies which should provide plenty of debris to feed a hungry black hole . ... Black Holes in Galactic Centers . ...