Dall sheep rams at Polychrome Pass, Denali National Park, Alaska, USA (© Patrick J. Endres/Getty Images)

Blue icebergs near Cuverville Island, Antarctica (© Mike Hill/Getty Images)

A frosty winter morning at Glastonbury Tor, Somerset (© DEEPOL by plainpicture/Adam Burton)

Mother cheetah and her cub in the Maasai Mara nature reserve, Kenya (© gudkovandrey/Adobe Stock)

Salzburg with Salzach river, Austria (© MacEaton/Alamy)

An 1840 design for the Analytical Engine by Charles Babbage (© Science & Society Picture Library/Getty Images)

Fountains Abbey cellarium, North Yorkshire (© k33adr/iStock/Getty Images Plus)

Petrified Forest National Park, Arizona, USA (© Ian Shive/Tandem Stills + Motion)

Glow worms in Blue Mountains National Park, Australia (© Leelakajonkij/Getty Images)

Arctic fox in Dovrefjell-Sunndalsfjella National Park, Norway (© Andy Trowbridge/Minden Pictures)

The shadow of Mount Everest over the western Himalayas in Nepal (© Kent Karvey/KH Films, Inc./Tandem Stills + Motion)

Wicker fields in Cañamares, Spain (© David Santiago Garcia/Alamy)

Old Town and El Panecillo Hill in Quito, Ecuador (© Karol Kozlowski/plainpicture)

American robin perched on a branch in Canada (© marcophotos/Getty Images)

The chapel and hermitage of Santa Justa in Cantabria, Spain (© Luis Miguel Martin/Getty Images)

The Château du Haut-Kœnigsbourg in the Vosges mountains, Alsace, France (© Leonid Andronov/Shutterstock)

Christmas-themed beach huts in Bournemouth (© Allouphoto/Alamy)

The December full moon seen through Christmas lights (© Jesus Merida/Getty Images)

Aurora Borealis above the Brooks Range in Alaska, USA (© Noppawat Tom Charoensinphon/Getty Images)

Performers dressed as Father Christmas from the Ministry of Fun Santa School in London (© Matt Dunham/AP Photo)

Sunlight in the forest of Western Siberia, near the city of Raduzhny, Russia (© Leonid Ikan/Shutterstock)

Winter scene illuminated on the Palais de l'Isle in Annecy, Haute Savoie, France (© blickwinkel/Alamy)

Aerial view of Hornsey, Crouch End and the City of London (© Matt Cooper/Gallery Stock)

Christmas tree at Weissensee, a small lake near Ehrwald in Tyrol, Austria (© nagelestock/Alamy)

Trees on the northern slope of Mount Khomyak in the Carpathian Mountains, Ukraine (© panaramka/Getty Images)

Royal Pavilion Ice Rink in Brighton, East Sussex (© Chris Gorman/Getty Images)

St Mary's church and oast houses in Salehurst, East Sussex (© JohnnyPowell/iStock/Getty Images Plus)

Kjell Henriksen Observatory in Svalbard, Norway (© Vincent Fournier/Gallery Stock)

Mountain goats in the Yukon, Canada (© Mark Newman/Getty Images)

Westerheversand Lighthouse in Westerhever, Germany (© Sandra Bartocha/Minden Pictures)

Bonfire to celebrate New Year's Eve in 2014 in Reykjavik, Iceland (© Ragnar Th Sigurdsson/Alamy)