Supermassive black holes, magnetars, neutron stars, and starburst galaxies are the most herculean things in the observable universe. But is there anything that is even more powerful than these beasts? The objects that we're going to talk about in this episode of the series shine so brightly that they can eclipse an entire galaxy that contains them. This means their energy output per second is more than that of about 100 billion stars together. These powerful dynamos have fascinated astronomers since their discovery half a century ago. They are none other than the mighty quasars!
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