Astronomers spot an extremely rare galaxy mega-merger

Scale in the universe is hard to understand from a purely human perspective.

Many times, the math just doesn't sit well with our brains, which evolved to capture and process data about the world around us rather than grok the complexities of stellar dynamics and galaxy mergers.

But every once in a while, astronomers find something that, if we can wrap our heads around the numbers, gives a sense of just how big the universe is. ...