A coil-shaped Helix Nebula showing a fine web of filamentary “bicycle-spoke” features embedded in the colorful red and blue ring of gas. At 650 light-years away, the Helix is one of the nearest planetary nebulae to Earth. A planetary nebula is the glowing gas around a dying, Sun-like star. (Photo by Reuters/NASA)

Dancers attend a dress rehearsal for the new grand show “THE WYLD” at Friedrichstadt-Palast in Berlin October 2, 2014. Ten choreographers are working with 60 dancers from the world's largest show ballet company to create the flamboyant stage spectacle. The show's name, “THE WYLD”, represents human nature in its diversity and the wilderness of the big city – in this case, Berlin. The premiere of the 10.6 million euro ($13.5 million) show, the largest production budget in the 95-year history of Friedrichstadt-Palast, is on October 23, 2014. (Photo by Hannibal Hanschke/Reuters)

A man carries his wife on his back as they make their way with their luggage along a flooded tunnel to catch their train, after heavy rainfall hit Jinhua, Zhejiang province, China, July 21, 2015. (Photo by Reuters/China Daily)

A demonstrator wearing a mock school uniform costume is pictured next to a traffic police officer during a rally held to support women's rights to an abortion in Santiago, Chile, July 25, 2015. (Photo by Ivan Alvarado/Reuters)

A participant attempts to control his craft during the Red Bull Flugtag Russia 2015 competition in Moscow, Russia, July 26, 2015. Enthusiasts competed in disciplines on the longest distance of the flight, on the creativity of self-made aircrafts and on the originality of the performance in an attempt to win the contest, according to organizers. (Photo by Sergei Karpukhin/Reuters)

People try to board a goverment bus during the second day of a suspension of public transport services in Apopa, El Salvador July 28, 2015. Violent gangs in El Salvador ordered bus drivers to strike on Monday in a conflict that has killed six people and left thousands of commuters stranded on the streets of the Central American capital, police and bus company officials said. (Photo by Jose Cabezas/Reuters)

A General Atomics MQ-9 Reaper stands on the runway during “Black Dart”, a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. (Photo by Patrick T. Fallon/Reuters)

A corgi named Jojo crashes while riding a wave in the medium size dog competition during the 10th annual Petco Unleashed surfing dog contest at Imperial Beach, California August 1, 2015. Proceeds raised at the event go to benefit the San Diego Humane Society. (Photo by Mike Blake/Reuters)