A 16 year study that involved staring at the stars for ages and everyone getting very, very cold, has discovered that there’s pretty much definitely a massive black hole at the centre of our galaxy, the Milky Way.
Minor fluctuations spotted in the movements of stars have, apparently, signalled to people who understand this sort of stuff, that an object with four million times the mass of our Sun must be sitting there exerting its gravitational pull over all nearby stars.
We now have “the best empirical evidence that super-massive black holes do really exist” according to project leader Professor Reinhard Genzel, from the Max-Planck Institute for Extraterrestrial Physics in Garching, Germany.
So that’s why the sky is black at night. Seems so obvious now with the benefit of hindsight.