An intensely dense hole, 6.5 billion times as massive as the sun, is located at the center of a massive galaxy 55 million light years from Earth. Known as a "black hole," scientists have finally discovered its first image, providing a peek at an object once thought to be unseeable and confirming some of Albert Einstein's longstanding theories about general relativity. Learn more about your ad choices. Visit megaphone.fm/adchoices
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