For decades, humanity has searched the universe for signs of alien life — but some scientists warn that finding it may come with terrifying consequences. This video explores NASA’s Voyager missions, ...

British cosmologist Stephen Hawking launched Monday the biggest-ever search for intelligent extraterrestrial life in a 10-year, $100-million (92-million-euro) project to scan the heavens. Russian ...

stephenhawking.co.uk offers students, teachers and the public a plain-English, carefully referenced guide to the physicist’s work, with interactive tools and a free companion ebook. A share of revenue ...