How are black holes the brightest objects in the universe?

Quasars, or extremely active black holes are the brightest objects in the universe. But aren't black holes meant to be invisible?
VR180 version of this video:
Based on the Illustris Project simulation, we also look at radio-mode and quasar-mode feedback, seemingly exploding galaxies.

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Image Credits: NASA/ESA/ESO/Illustris Project
Music Credits: Charon - Joseph Reilly

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