Hubble Astronomers Uncover an Overheated Early UniverseHubble Astronomers Uncover an Overheated Early Universe
<p><a target="_blank" href="http://imgsrc.hubblesite.org/hu/db/images/hs-2010-31-a-web_print.jpg" rel="nofollow"></a>During a period of universal warming 11 billion years ago, quasars — the brilliant core of active galaxies — produced fierce radiation blasts that stunted the growth