What's the 'anti-universe' — and can scientists find it?

An entire universe made of anti-matter might exist somewhere, say scientists. Will a new space-based detector offer proof for this mind-bending theory?

An entire universe of anti-matter could be closer than we think.
(Image credit: Corbis)

It sounds like something out of a comic book, but scientists say an "anti-universe" may exist — and we could be on the verge of discovering it. Here's an instant guide:

Is there really an anti-universe?

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