Back in 1998, researchers studying supernovae discovered that our universe is accelerating apart. Up until that point, it had been understood that our universe’s expansion was either going to slow to a stop, continue on as is-ish, or reverse it’s motion and collapse in on itself. The idea that it could be accelerating apart wasn’t even on the list because it would require some new something to exist that is causing the acceleration, and as so often happens, our creativity failed to account for the diversity of things at play in shaping our cosmos. Following our tradition of bad names,...