Wow

Wow. From super-massive black holes to ultra-massive black holes – the monsters in space are growing all the time – see http://phys.org/print275069018.html How do they measure these things? By the amount of X-rays and radiowaves they generate. Ultra-massive black holes were predicted to exist to explain the most powerful outbursts. Sort of circular logic, on the face of it, but no doubt quite reasonable when looked at without fear or favour.