It’s complicated. But Veritasium did a really good video a couple days ago explaining it: [https://www.youtube.com/watch?v=Q1bSDnuIPbo](https://www.youtube.com/watch?v=Q1bSDnuIPbo)
I won’t attempt to explain it fully since I’m sure I’ll screw it up, but basically it has to do with the way the black hole captures the light and how some light escapes in the direction you’re looking.
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