At http://phys.org/print375467925.html … getting round the problem of a gamma ray burst being detected at the same time as the hypothetical merger of two black hole has not vexed mainstream for too long – just a couple of days it would seem. We now have a black hole swalling a massive star – and spitting out a gamma ray burst.
At http://phys.org/print375441286.html …. we have a little history of 'globular clusters' – don't know what they are then read the link. The role of Charles Messier is interesting.