Scientists have long pondered on one of the universe's greatest mysteries: Are we alone? They have searched the cosmos, but so far, there has been no sign of extraterrestrial life. Is it possible that ...

While parallel universes are a staple of science fiction, there are some real scientific theories to support them. But if parallel universes do exist, could we ever travel to them? It certainly wouldn ...

What if there are other universes, just like ours? With an infinite number of Earths? With uncountable versions of you? And what if we don’t have to look too far to find them? Maybe a mirror version ...

The universe is a strange, beautiful place—rich with possibilities and governed by the odd rules of quantum mechanics. One of the most mind-bending ideas from this realm is the many-worlds ...

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The universe is expanding faster and faster, but not all scientists agree that dark energy is the cause. Perhaps, instead, our universe keeps colliding with and absorbing smaller 'baby universes,' a ...

There may be another universe just a millimeter away from ours, hovering in an extra, hidden dimension. At any moment this second universe (or “membrane,” in M-theory—a relative of superstring theory) ...

Ever wondered how physicists got a reputation for being boring, cosmologists tedious? Wonder no more as Horizon shows what these some of these highly intelligent doyens of the science world have been ...