TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Crossing Westminster Bridge. Thermogram of pedestrians walking across Westminster Bridge in London, with the Big Ben clock tower and the Palace of Westminster, the seat of the UK parliament, in the background. Thermography records surface temperatures by detecting the long-wavelength radiation emitted by an object. Here, the colour-coded temperature scale runs from white (warmest) through pink, red, orange, yellow, green and blue to black (coldest).
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