By Rick Steelhammer Since January, scientists taking part in a $100 million, 10-year search for extraterrestrial intelligence have used Pocahontas County's Green Bank Telescope to search the 200 stars nearest Earth for radio signals bearing clues of the possible presence of other civilizations. The search, called Project Breakthrough Listen, was announced last July by Russian billionaire and space philanthropist Yuri Milner and renowned cosmologist Stephen Hawking. The announcement that Breakthrough Listen observations are underway came during a news conference in New York on Tuesday, during which Milner and Hawking announced the launch of Breakthrough Starshot, another $100 million space research initiative funded by Milner's Breakthrough Foundation.