Cold Gallery

Police Public Call Box in the snow, London

A Police Public Call Box, on a London street on a snowy day. The Metropolitan Police introduced police boxes throughout the London area between 1928 and 1937. The one pictured is a Mackenzie Trench style police box, made famous by the long-running TV series, Doctor Who. The boxes were installed so that members of the public could make emergency calls to the police, but many boxes are now disused or have been withdrawn from service because of the prevalence of the mobile phone

© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10413392

Frost-covered trees and Glastonbury Tor

Frost-covered trees and Glastonbury Tor. Hoar frost covering three willow (Salix sp.) trees in a field on a farm. St Michael's Tower can be seen on the summit of Glastonbury Tor in the background. Hoar frost results when heat is lost through radiation into the open sky on cold clear nights, causing objects to become colder than the surrounding air. This temperature difference causes the water in the warmer air to condense on the colder objects and then freeze into small ice crystals. Photographed in Somerset, England, UK, in December

© DUNCAN SHAW/SCIENCE PHOTO LIBRARY

Northern lights

Northern lights. The Northern Lights are created as electrically charged particles from the Solar wind are pulled in toward the magnetic poles by the Earth's magnetic field. As these particles collide with the atoms of gas in the ionosphere about 80km above the ground, they give the atoms energy and they become excited'. The atoms spontaneously release this energy in discrete amounts, resulting in particular colours of light being emitted. Photographed in the Swedish Arctic

© Jeremy Walker