00550nam a2200085Ia 4500008004100000245005200041300027500093650001300368856008300381170517s9999    xx            000 0 und d  aThrough the Wormhole: The Riddle of Black Holes  aThey are the most powerful objects in the universe. Nothing, not even light, can escape the gravitational pull of a black hole. Astronomers now believe there are billions of them out in the cosmos, swallowing up planets, even entire stars in violent feeding frenzies....  xScience.  uhttp://topdocumentaryfilms.com/through-the-wormhole-the-riddle-of-black-holes/