The solar car of the Italian team competes in the Atacama Solar Challenge—a solar car race in the Atacama Desert in northern Chile—in Iquique, 2,000 kilometers north of Santiago, on April 19,2016. Fifteen teams from four countries are participating in the six-day race. #

The Bubble Nebula is seen in an image captured in February of 2016, by the Hubble Space Telescope's Wide Field Camera 3 and released April 21, 2016. The nebula is seven light-years across—about one-and-a-half times the distance from our sun to its nearest stellar neighbor, Alpha Centauri—and resides 7,100 light-years from Earth in the constellation Cassiopeia. #

A picture taken April 15, 2016, show tens of thousands of vehicles that were seized by police forces due to traffic violations at a makeshift impound in the Wadi Laban suburb, west of Riyadh, Saudi Arabia. #

Two participants from Imatong and Terekeka counties take part of the South Sudan National Wrestling Competition for peace at Juba Stadium, on April 20, 2016. South Sudan is holding a wrestling for peace tournament, bringing together athletes from around the country. The last big tournament was canceled when civil war broke out in December 2013. #

Teresita Gapayao, 51, a scavenger for 12 years, wades through garbage using a makeshift raft made from styrofoam on the Estero de Vitas tiver in Tondo, Manila, on April 21, 2016. Gapayao collects plastic bottles and anything that can be sold to junkshops as a living earning an average of $3 a day. #

Two giant terracotta busts of Britain's Queen Elizabeth and Prince Philip on display in the garden of Fifield House Farm near Windsor, England, on April 20, 2016. #

A South Korean worker cleans a statue of South Korean Admiral Yi Sun-sin ahead of the coming of spring at Gwanghwamun Plaza in Seoul, South Korea, on April 18, 2016. Admiral Yi was a Korean hero who defeated the Japanese invaders in the 16th century. #

Afghan farmers harvest opium sap from a poppy field in the Chaparhar district of Nangarhar province on April 19, 2016. Opium poppy cultivation in Afghanistan dropped 19 percent in 2015 compared to the previous year, according to figures from the Afghan Ministry of Counter Narcotics and United Nations Oiffce on Drugs and Crime. #

A man rides on the outside of a dump truck through floodwaters in Houston, Texas, on April 18, 2016. Storms dumped more than a foot of rain in the Houston area, flooding dozens of neighborhoods and forcing the closure of city offices and the suspension of public transit. #

Migrants ask for help from a faltering boat as they are approached by the SOS Mediterranee's ship Aquarius, background, off the coast of the Italian island of Lampedusa on April 17, 2016. #

Snowboarders in costumes depicting a firefighter and fire victim, slide down before an attempt to cross a pool of water at the foot of a ski slope at the Bobrovy Log ski resort on the suburbs of the Siberian city of Krasnoyarsk, Russia, on April 17, 2016. #

French former overall Ski World Cup winner and race car driver Luc Alphand skis down a big sand dune during an off-road mapping recognition exercise ahead of the Silk Way Rally 2016 in the Gobi desert, some 2,000 kilometerss (1250 miles) northwest of Beijing, on April 20, 2016. #

Greek actress Katerina Lehou, playing the role of High Priestess, lights a torch from the sun's rays reflected in a parabolic mirror during the dress rehearsal for the Olympic flame lighting ceremony for the Rio 2016 Olympic Games at the site of ancient Olympia in Greece, on April 20, 2016. #

Celeste Corcoran, who lost both her legs in the Boston Marathon bombings, greets runners at they finish the 120th running of the Boston Marathon in Boston, Massachusetts, on April 18, 2016. #

From left, actor Mark Hamill, director Rian Johnson, Britain's Prince Harry, Prince William, actor John Boyega, producer Ram Bergman, BB-8, Chewbacca, actress Daisy Ridley, and Lucasfilm president Kathleen Kennedy pose during a tour of the Star Wars sets at Pinewood studios in Iver Heath, west of London, on April 19, 2016. Prince William and Prince Harry were touring Pinewood to visit the production workshops and meet the creative teams working behind the scenes on the Star Wars films. #

Wild bluebells, which bloom around mid-April, turning the forest completely blue, form a carpet in the Hallerbos, also known as the “Blue Forest,” near the Belgian city of Halle, Belgium, on April 17, 2016. #