Aurora australis over the Halley VI Research Station in Antarctica (© Stuart Holroyd/Alamy)

Male Atlantic puffin gives his mate nesting material, Skomer Island, Wales (© Danny Green/Minden Pictures)

Male Atlantic puffin gives his mate nesting material, Skomer Island, Wales (© Danny Green/Minden Pictures)

Two rhinos and an oxpecker bird in the Amakhala Game Reserve, South Africa (© Robert Harding World Imagery/Offset)

Christmas tree farm in Ontario, Canada (© FatCamera/Getty Images Plus)

'America's Playground' by Derrick Adams in 2018 in Miami Beach, Florida (© Jeff Greenberg/Alamy)

Flag above the USS Arizona Memorial in Honolulu, Hawaii (© PJF Military Collection/Alamy)

Circuit board of a computer (© Bobkov Evgeniy/Shutterstock)

Golden Hall in Stockholm City Hall for today's Nobel Prize award ceremonies (© Mikhail Markovskiy/Shutterstock)

Tengboche Monastery in the Himalayan Mountains, Nepal (© Kyle Hammons/Tandem Stills + Motion)

Icelandic sheep for the first night of the Yule Lads (© John Porter LRPS/Alamy)

Bernina Express on the Landwasser Viaduct, Graubünden, Switzerland (© Marco Bottigelli/Getty Images)

Spruce grouse in a spruce tree in Denali National Park and Preserve, Alaska (© Yva Momatiuk and John Eastcott/Minden Pictures)

Beech forest covered with frost and snow, Ardennes, Belgium (© Philippe Moes/Alamy)

Table Mountain, Cape Town, South Africa (© 4FR/Getty Images)

Temple of Saturn in the Roman Forum, Italy (© Joe Daniel Price/Getty Images)

Annual Schwäbisch Hall Weihnachtsmarkt in the market square, Baden-Württemberg, Germany (© sack/Getty Images Plus)

Cabins in Valley Forge National Historical Park, Pennsylvania (© Mark C. Morris/Shutterstock)

Rainbow eucalyptus trees along the Hana Highway, Maui, Hawaii (© GlowingEarth/Getty Images Plus)

The Seventeen-Arch Bridge over Kunming Lake, Beijing Summer Palace, China (© Jia Wang/Getty Images)

｢夕暮れの東京タワー｣ (© rudi1976/Alamy)

Gentoo penguins airing grievances in Antarctica (© Grafissimo/Getty Images)

A herd of reindeer in Norway (© Lena Granefelt/plainpicture)

Christmas decorations in Warsaw, Poland (© David Milsen/Alamy)

The Church of St. Thomas above the village of Praprotno, for Slovenia Independence and Unity Day (© Guy Edwardes/Minden Pictures)

Skating on a frozen canal near the windmills at Kinderdijk, Netherlands (© Lourens Smak/Alamy)

Trumpeter swans at Kelly Warm Springs, near Kelly, Wyoming (© DEEPOL by plainpicture)

German ski jumper Markus Eisenbichler competing in the Four Hills Tournament, Innsbruck, Austria, on January 3, 2018 (© Daniel Karmann/picture alliance via Getty Images)

Saguaro cacti in the Sonoran Desert near Tucson, Arizona (© Jack Dykinga/Minden Pictures)

Fireworks for New Year's Eve in Backnang, Germany (© Lilly/Alamy)