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The universe is not just a vast empty ocean dotted with galaxies: most atoms actually drift between the two, in the intergalactic medium.
If we look closely, we can see who's in charge here: quasars, the most powerful objects in existence. As small as a grain of sand compared to the Amazon River, they reside at the centers of some galaxies, shining with the power of a trillion stars, throwing out enormous jets of matter, completely reshaping the cosmos around them. They are so powerful that they can kill a galaxy.
What are they and how do they shape the structure of the universe to their liking?

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