Scientists may have discovered the very first 'ghost' black hole from a different universe

It's common knowledge that, because of the speed at which light travels, we can see things in space that aren't even there anymore. If we peer at a distant galaxy we're really only seeing what the objects within it looked like when the light itself was beaming in our direction. If the galaxy is a thousand light-years away, we're seeing what the galaxy looked like a thousand years ago. Now, researchers believe that they may be able to use a similar technique to search for black holes that don't e...