25 febrero 2015
The discovery of the brightest quasar in the early universe, powered by the most massive black hole yet known at that time presents a puzzle to researchers: How could something so massive and luminous form so early in the universe, only 900 million years after the Big Bang?
http://feeds.sciencedaily.com/~r/sciencedaily/~3/tcQtFo5G1-s/150225142452.htm
