The Week in Pictures: May 7-13, 2016 (21 images)

Washington Nationals' Clint Robinson is dunked with water by teammate Michael Taylor after Robinson hit a walk-off game winning home run in the ninth inning against the Detroit Tigers at Nationals Park in Washington, D.C., on May 9, 2016. The Nationals defeated the Tigers 5-4. Photo by Kevin Dietsch/UPI

Delrish Moss takes the oath of office from Judge Donald L. McCullin as the new Police Chief for the City of Ferguson, Mo., in Ferguson on May 9, 2016. Moss, a 32 year veteran of the Miami Police Department, will become the departments first permanent African-American police chief taking the place of embattled police chief Tom Jackson. Jackson left the department in March 2015 after the civil unrest that followed the police shooting of 18-year-old Michael Brown in August 2014. Photo by Bill Greenblatt/UPI

Lily-Rose Depp arrives at a photocall for the film "La Danseuse (The Dancer)" during the 69th annual Cannes International Film Festival in Cannes, France, on May 13, 2016. Photo by David Silpa/UPI

The planet Mercury is seen in silhouette, lower left, as it transits across the face of the sun on Monday, May 9, 2016. Mercury passes between Earth and the sun only about 13 times a century, with the previous transit taking place in 2006. The transit started at 7 a.m. on the east coast of the United States and takes more than seven hours, with this image being made in Boyertown, Pa. NASA Photo by Bill Ingalls/UPI