Perhaps part of the allure is that these enigmatic objects have never actually been "seen". But this could now be about to change as an international team of astronomers is connecting a number of telescopes on Earth in the hope of making the first ever image of a black hole.
The surprising answer is: nobody knows. Physicists, despite trying for almost a century to rule it out, have so far failed. The known laws of physics do not forbid time travel. In fact, they appear to make it easy - at least in principle.
28.000 light years away from Earth, towards the center of our Milky Way, an unexpectedly mighty hurricane blows around a tiny black hole. It is the strongest wind ever observed by astronomers and a great surprise because these pushed off particles exceed the speed of 32 million k.p.h