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Cosmic discovery explained using sock

Scientists say they have extraordinary new evidence to support a Big Bang Theory for the origin of the Universe. The BBC's science correspondent Jonathan Amos explains the discovery using a sock.

Scientists say they have extraordinary new evidence to support a Big Bang Theory for the origin of the Universe.

Researchers believe they have found the signal left in the sky by the super-rapid expansion of space that must have occurred just fractions of a second after everything came into being.

It takes the form of a distinctive twist in the oldest light detectable with telescopes.

The BBC's science correspondent Jonathan Amos explained the discovery using a sock.