- The notion of parallel universes leapt out of the pages of
fiction into scientific journals in the 1990s. Many scientists
claim that mega-millions of other universes, each with its own
laws of physics, lie out there, beyond our visual horizon. They
are collectively known as the multiverse. - The trouble is that
no possible astronomical observations can ever see those other
universes. The arguments are indirect at best. And even if the
multiverse exists, it leaves the deep mysteries of nature
unexplained. In the past decade an extraordinary claim has
captivated cosmologists: that the expanding universe we see
around us is not the only one; that billions of other universes
are out there, too. There is not one universe—there is a
multiverse. In Scientific American articles and books such as
Brian Greene’s latest, The Hidden Reality, leading scientists
have spoken of a super-Copernican revolution. In this view, not
only is our planet one among many, but even our entire universe
is insignificant on the cosmic sc