On September 14th 2015 two giant laser interferometers known as LIGO, the most sensitive scientific instruments ever built, detected gravitational waves from the merger of a pair of massive black holes more than a billion light years from the Earth. Join Professor Martin Hendry as he recounts the inside story of this remarkable discovery – hailed by many as the scientific breakthrough of the century – and explore the exciting future that lies ahead for gravitational-wave astronomy as we open an entirely new window on the Universe.

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