This is the moment a diver appears to shake hands with a giant 52ft whale. The divers were just metres away when one humpback whale – which weighs 36,000kg – extends its giant flipper in a peaceful manner. (Photo by Masa Ushioda/SeaPics/Solent News & Photo Agency)

“Natacha Pisarenko was born in Buenos Aires and studied photography at that city’s School of Photographic Arts. Pisarenko currently works out of Buenos Aires, Argentina. She started her career in 1988 as a photographer for La Nación, one of Argentina’s largest newspapers, then joined the AP in Buenos Aires in 2002”. – Associated Press. Photo: A fan wearing leggings marked with the stripes of Great Britain's flag rests on the grass at the rowing venue in Eton Dorney, near Windsor, England, at the 2012 Summer Olympics, Monday, July 30, 2012. (Photo by Natacha Pisarenko/AP Photo)

The image of President George Washington is seen on an engraving plate for a one dollar bill at the Bureau of Engraving and Printing in Washington November 14, 2014. (Photo by Gary Cameron/Reuters)

Keith Haubrich of Seattle, Wash., reacts to the crowd while competing in the Dali Moustache division during the fourth annual Just For Men National Beard and Moustache Championships Saturday, September 7, 2013 in New Orleans. Haubrich went on to win the gold medal for the Dali division.Contestants competed in 18 different categories including Dali, full beard natural and sideburns.(Photo by Susan Poag/AP Photo)

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)

It might have been foggy in the Willamette Valley, but Cerridwen Martin was able to revel in a view of the top of the clouds from the summit of Spencer Butte in Eugene, Ore., on Tuesday, December 16, 2014. Martin was joined by Joe Martinson, right, for the 1.1 mile trek. Fog shrouded much of the city for most of the day. (Photo by Andy Nelson/AP Photo/The Register-Guard)

World Champion Matthias Dolderer of Germany flies over the Horseshoe Bend near Lake Powell in Page, United States during the transfer flight from Indianapolis to Las Vegas to prior the final stage of the Red Bull Air Race World Championship on October 12, 2016. (Photo by Predrag Vuckovic/AFP Photo)

Brush your teeth and get cleaned up for the week ahead! These animals answered the call of good dental hygiene. Here: Hamster holds toothbrush. (Photo by Neo Vision/Getty Images/Amana Images RM)