There's no direct proof yet, but we have detected the magnetic fields that theories predict, and of course observe the gravitational effects. The Event Horizon

There's no direct proof yet, but we have detected the magnetic fields that theories predict, and of course observe the gravitational effects. The Event Horizon Telescope[0] will probably deliver something more tangible by 2018. [0]http://www.nature.com/news/how-to-hunt-for-a-black-hole-with-a-telescope-the-size-of-earth-1.21693 http://www.nature.com/news/how-to-hunt-for-a-black-hole-with...