With just 600 residents and no cities, Sark, located about 80 miles off the coast of England in the English Channel, is the first dark-sky island. Phllip Capper/Flickr hide caption

itoggle caption Phllip Capper/Flickr

A man has his photo taken by a companion at the top of the the so-called "Rocky Steps" in front of the Philadelphia Museum of Art during a blowing snowstorm Dec. 26. Philadelphia has been pounded by multiple heavy snowstorms this winter and has learned the terrible truth: Sometimes, weather hype is not hype at all. Jacqueline Larma/AP hide caption

itoggle caption Jacqueline Larma/AP

The open pit mine at Molycorp Minerals' rare earths mining and processing facility in Mountain Pass, Calif. The mine is expected to produce 40,000 tons of rare earth minerals each year after a $500 million expansion project. Courtesy of Molycorp Minerals hide caption

itoggle caption Courtesy of Molycorp Minerals

At the Cleveland Clinic, technician Larry Raber and physician Mei Lu practice the ultrasound technique to measure CCSVI in patients with MS on medical student Claudiu Diaconu. Cleveland Clinic Center for Medical Art & Photography hide caption

itoggle caption Cleveland Clinic Center for Medical Art & Photography

The SpaceX Falcon 9, carrying a Dragon capsule, lifts off the launch pad at Launch Complex 40 at Cape Canaveral on Dec. 8, 2010. NASA hide caption

itoggle caption NASA