The orbits of the new extreme dwarf planet 2015 TG387 and its fellow inner Oort Cloud objects 2012 VP113 and Sedna as compared with the rest of the Solar System. 2015 TG387 was nicknamed ͞"The Goblin" by its discoverers, as its provisional designation contains TG and the object was first seen near Halloween. Illustration by Roberto Molar Candanosa and Scott Sheppard, courtesy of Carnegie Institution for Science. hide caption

Horsham, Pa., is one of many towns around the country grappling with potentially harmful chemicals in its water. They're known as PFAS, and they're linked to cancer and other illnesses. Matt Rourke/AP hide caption

Mexican President-elect Andres Manuel Lopez Obrador, center, stands Tuesday with Ana Ignacia Rodríguez Marquez, a former leader of the student movement of 1968, at a ceremony marking the 50th anniversary of the 1968 Tlatelolco massacre, at the Tres Culturas square in Mexico City. Alfredo Estrella/AFP/Getty Images hide caption

Judge Brett Kavanaugh testifies before the Senate Judiciary Committee on Thursday. Pool/Getty Images hide caption

Marie Curie (left), French physicist and winner of the 1903 Nobel Prize for physics, Canadian Donna Strickland (middle), who won the 2018 prize for her work with lasers, and physicist Maria Goeppert Mayer (right), who won for her work in atomic physics in 1963. Hulton Archive/Stringer/Getty Images, University of Waterloo/The Canadian Press via AP, Bettmann/Getty Images hide caption

"No one really explains to you taxes, and contracts, and how to chase a client for that bill that they owe you — like, the nitty-gritty," says P. Kim Bui, a freelance consultant. Courtesy of P. Kim Bui hide caption

Prince's first posthumous release, Piano & a Microphone 1983, proves the singer approached everything, even an unfinished idea, as a performance. Allen Beaulieu/Courtesy of the Prince Estate hide caption