It’s the largest known structure in the universe. It baffles cosmologists and catches the imagination of quantum physicists. It defies known patterns and statistical probability. And it’s a giant stretch of nothing. Could it be the point at which another universe bumps into our own? The Eridanus supervoid was discovered back in 2004, as scientists scanned the patterns of the cosmic microwave background (CMB) left over from the Big Bang. As they looked at the Eridanus constellation, they found a spot that was both colder than it should have been - and larger than any model could predict.