It’s (relatively) common knowledge that black holes consume pretty much anything and everything … and apparently that includes each other, as astronomers speculate that the black hole at the center of our own galaxy may have gobbled up a smaller sibling over 100 million years ago.

While we’re on the subject of astronomy, and just in case you get asked by a curious child and don’t want to get caught on the hop, you may wish to learn why space is dark. [Image by D P Hershman]