It’s possible that the universe isn’t uniform past what we can see, and conditions are wildly different from place to place, says Caltech astrophysicist Sean Carroll. “That possibility is the cosmological multiverse. We don’t know if there is a multiverse in this sense, but since we can’t actually see one way or another, it’s wise to keep an open mind.”
Astronomers have recently discovered that the expanse of space-time within range of our telescopes—‘the universe’—is only a tiny fraction of the aftermath of the Big Bang. In a new, mind-boggling project, an international team of astronomers have mapped 300,000 previously unknown objects using the Low Frequency Array (LOFAR) telescope, almost all of which are galaxies in the distant universe; their radio signals traveling billions of light years to reach Earth.