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Photons, spacecraft, atomic clocks & Einstein (27 Oct 2011)

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Uploaded on Nov 1, 2011

UCL Lunch Hour Lecture: Photons, spacecraft, atomic clocks and Einstein -- fundamental physics in the space environment

Professor Marek Ziebart (UCL Space Geodesy and Navigation)

Satellites designed, built and launched by humans orbit the earth to carry out a myriad of tasks, friendly and hostile, commercial and scientific. Many of these missions supply critical data to model, mitigate and predict planet-scale processes such as El Nino events, sea level rise, plate tectonics and the earthquake cycle. The spacecraft move at between 4 and 8 kilometres per second, and are between 500 and 20,000 km above the earth's surface but for scientific purposes we need to know where they are to within a few centimetres, and we need to know the time they transmit their signals at the nano-second level. This lecture explains how that is achieved using concepts from fundamental physics.

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