Australian researcher professor Matthew Bailes from Swinburne University... "We think it must be an explosion from something very compact like a supernova core or merging neutron stars because we know the size of the emitting region is less than 1,500 km" ...Or it could be something even more exotic and theoretical, like a final burst of radio emission from an evaporating mini black hole... "But this very, very bright flash occurred just once, picked up simultaneously across three detectors, and at a distance of up to three billion light years away, so it could be something completely new." ...Bailes sees...