What's actually going on in that cryptic black hole photo?

"We have now seen the unseeable."These were the words spoken by astrophysicist Avery Broderick on Wednesday morning, one of some 200 scientists of the Event Horizon Telescope collaboration who captured humanity's first image of a black hole -- a zone in space so gravitationally powerful that whatever light falls in can't possibly escape. "Black holes are gravity run amok," said Broderick.Yet, we now have a picture of "the unseeable."More precisely, we can see a prominent ring of super-heated gas