Space.comScience & Astronomy Poll: What Are Black Holes, Really? By SPACE.com Staff | January 25, 2014 09:15am ET MORE Black holes are mysterious objects that not even light can escape. But what exactly are they? Massive gravitational singularities where light cannot even escape. The mouth of a wormhole that leads to another place, or even universe. A fluke of physics. An invention by mankind to try and fathom the complex nature of an unknowable universe.