After some days with temperatures below freezing point, I was out skating at some lakes at the outskirts of Oslo in Norway. After a while I noticed something on the ice. To my astonishment it was a dead frozen frog.

Some of the best entries so far in the 2016 Insight Astronomy Photographer of the Year competition. There are two weeks left to enter, and the winners will be announced in September. Here: Aurora over Laksvatn Fjord, Laksvatn, Norway. The aurora borealis dances in the skies over the town of Laksvatn, with the Milky Way to the left. The image is a single shot with no compositing, only post-processing to bring out the aurora, and some colour corrections. The photographer Matt Walford said: “I love the way the northern lights look like they are just wistfully dancing over the fjord, framed by the mountains on either side”. (Photo by Matt Walford/National Maritime Museum)

“These stunning ultra-high speed photos of water droplets were captured by photographer, Ronny Tertnes, 48, from Bergen, Norway. They show the water’s displacement as various liquids are being dropped in. Ronny, who works full time as an IT administrator, set up his camera and flash rigs to capture the exact moment a droplet hit the surface, sometimes causing several drops to collide into each other”. – TwoByTwoEditorial.co.uk. (Photo by Ronny Tertnes/TwoByTwoEditorial.co.uk)

The UK VELUX Lovers of Light competition attracted 15,000 entries from amateur, professional and mobile phone photographers. Entrants were asked to create a landscape image which celebrates and captures daylight. The judges have whittled these down to a shortlist of ten finalists. The winner will be announced at the end of march with the snapper of the best shot winning a trip to Norway – which will be made during the summer period when the country experiences 24 hour daylight. Photo: “Carousel in the mist”; Prokoshko, Bosnia. (Photo by Marko Stamatovic/PA Wire)

Son doong cave is a cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch district, Quảng Bình Province, Vietnam. Currently the biggest known cave in the world, the cave is located near the Laos-Vietnam border. Inside is a large, fast-flowing underground river.
In early August 2013, the first tourist group explored the cave on a guided tour at a cost of US$3,000 each. The group had six members from Australia, Norway, Russia and USA and spent 7 days and 6 nights for the tour. Next exploration trips will be arranged.

A David Cameron look-alike poses with a polar bear model outside the Houses of Parliament as part of a Greenpeace protest on May 13, 2011 in London, England. The environmental charity Greenpeace arranged the protest to highlight the first anniversary of David Cameron’s speech when he pledged to make his new government the greenest ever. In April 2006 Mr Cameron traveled by huskie-drawn sledge when he visited the island of Svalbard in Norway to witness the effects of climate change. (Photo by Oli Scarff/Getty Images)

Beneath the Swedish capital lies an intricate web of underground train lines. More than 90 of the 100 stations in the 110km tunnel system, sometimes referred to as “the world’s longest art gallery”, have been decorated with paintings, installations, mosaics and sculptures by 150 artists since the 1950s. After spending a couple of weeks exploring arctic Norway and Sweden, London-based travel photographer Conor MacNeill headed underground to capture images of the metro stations. Here: A rainbow arcs over a girl on the platform of Stadion station. (Photo by Conor MacNeill/The Observer)

Eryn, owned by Tom Chudleigh in Canada. New global research has revealed that ‘shed-scapism’ is sweeping the world with more people than ever ditching their tools and transforming their sheds into zen dens. The research comes as the Cuprinol Shed of the Year competition joins forces with aspirational shed fan site, Cabin p*rn, to launch the first ever global category. We have a stunning suite of imagery of 9 sheds from across the world - from Norway to Slovenia, British Colombia to Colorado who have all submitted their sheds in the hopes of being crowned the first ever Global Shed of the Year. (Photo by Cuprinol/Rex Features/Shutterstock)