What are Gravitational Waves?

12 February 2016
Presented by Chris Smith

EARTH-GRAVITY-WELL

Artist concept of Gravity Probe B orbiting the Earth to measure space-time, a four-dimensional description of the universe including height, width, length, and time.

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What are gravitational waves and how were they found? What is UHT milk, why do stars look like pinpricks of light, what are shin splints, and is moving an injured body part bad for you?

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