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How to measure the universe

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The Royal Observatory in Greenwich, London has uploaded a video that gives a simple explanation of how astronomers measure the universe.

measuring the universe.
measuring the universe.

Have you ever wondered how we know the distance between Earth and Proxima Centauri? What about the furthest reaches of the universe — how do we know they're the furthest? The Royal Observatory in Greenwich, London currently has an exhibition on the subject and has uploaded a video that gives a simple explanation of how astronomers deal with a very complex problem.

Measuring the Universe: from the transit of Venus to the edge of the cosmos will run until September 2nd 2012, excluding July 7th - August 5th. Admission is free.