In this short animated video, Dr. Olivia Johnson of the Royal Observatory Greenwich (home of Greenwich Mean Time and the Prime Meridian) explains how scientists measure the universe using parallax, standard candles, and the Doppler effect. Got four minutes? Pick up some basic math. (Sorry, maths.)

Royal Observatory Greenwich is hosting an exhibit on Measuring the Universe through September. See also: Hank Green's explanation of how The Universe Has No Edge.

(Via Devour.)