X-ray evidence for the most massive black holes in our universe has been discovered -- but they're not supermassive, they're ULTRAmassive.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/0uoVnwWF-Jg" height="1" width="1"/>
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X-ray evidence for the most massive black holes in our universe has been discovered -- but they're not supermassive, they're ULTRAmassive.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/0uoVnwWF-Jg" height="1" width="1"/>