Fallen Angel by Jane Yolen

"'I saw the most amazing falling star last night,' Courtney said. 'It was the brightest ever.'" Three modern youngsters, all headstrong and opinionated, search for a falling star and are confronted by the supernatural. Scientific-minded, they at first try to rationalize what they see, but they eventually uses their scientific view of the world to help a fallen angel that needs wings in order to return to Heaven. "Fallen Angel" concerns a serious subject but is told with a good sense of humor and a light touch, and it has a terrific conclusion.