ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Liquid nitrogen tank. Truck used to carry liquid nitrogen around an astronomical observatory. Liquid nitrogen is used in astronomical observatories to cool equipment to help achieve high-precision observations. This is the Roque de Los Muchachos Observatory on the island of La Palma in the Canary Islands. The telescopes here, part of the Issac Newton Group, include the William Herschel Telescope (WHT), one of the largest optical telescopes in Europe. Photographed in 2006.
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