Our universe might be really, really big — but finite. Or it might be infinitely big. Both cases, says physicist Brian Greene, are possibilities, but if the latter is true, so is another posit: There ...

For more than a century, physicists have suspected that the familiar three dimensions of space and one of time might be only ...

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 ...

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 ...

Google's latest breakthrough in quantum computing, the Willow chip, is reigniting discussions among the scientific community about the possibility of parallel universes. Hartmut Neven, the founder and ...

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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 ...

Image: Ralph Losey using AI. In the history of technological revolutions, there are moments that challenge not only our understanding of what is possible but the very nature of reality itself.

This interview was originally broadcast on January 24, 2011. The Hidden Reality: Parallel Universes and the Deep Laws Of the Cosmos is now available in paperback. Greene is also hosting a NOVA series ...