The ESO - European Southern Observatory have been closely watching 28 stars at the centre of our galaxy for the last 16 years, and now they have released some stunning animation showing how these stars are orbiting an unseen object; “Sagittarius A*”, the supermassive black hole at the middle, 27000 light-years away from us, 4 million times more massive than our Sun.
One of the observed stars, S2, managed a complete orbit within the 16-year observation. During observations, an intense flare was spotted from the edge of SgrA* itself, which is probably one of the few ways to directly observe a black hole. See the Max Planck Institute's Galactic Centre Research pages for more information.