Episode Synopsis "How to make a supermassive black hole"

Apparently, the recipe is: Step 1 - Crash two galaxies together Step 2 - Wait for the two smaller black holes at the center of these galaxies to merge together, during which time lots of gas falls into them. Step 3 - Go to Step 1. Figuring this out was not as simple as it looks. Go here, here, and here, and here to learn more.

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