quasar
Concept
extremely luminous active galactic nuclei containing a massive black hole
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Videos Mentioning quasar

How Can Matter Be BOTH Liquid AND Gas?
PBS Space Time
Active galactic nuclei that glow from matter spiraling into a supermassive black hole, discussed in the context of how they would appear in the night sky.

Black Holes. Explained. For 2 More Hours.
PBS Space Time
Extremely powerful active galactic nuclei (AGN) that contain supermassive black holes with billions of solar masses, fueled by infalling gas.