Season 1 Episodes8
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Morgan Freeman
Self - Host
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Ranked #1 of 8 in Season 1•+0.2 vs season avg
They 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. New

Morgan Freeman
Self - Host
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"The Riddle of Black Holes" is episode 2 of Through the Wormhole season 1. It scored 8.3/10 from 289 votes, ranking #1 of 8 episodes this season (season average 8.1). It aired on June 16, 2010.