NASA Chandra, Spitzer Study Suggests Black Holes Abundant Among The Earliest Stars

By comparing infrared and X-ray background signals across the same stretch of sky, an international team of astronomers has discovered evidence of a significant number of black holes that accompanied the first stars in the universe.

via NASA Breaking News

http://www.nasa.gov/home/hqnews/2013/jun/HQ_13-170_Chandra_Black_Holes.html