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Listener Questions about light and black holes

Daniel and Kelly’s Extraordinary Universe

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How Could We Detect a Black Hole From Dark Matter?

Mateus from Poland asked about the possibility of having a black hole made entirely out of dark matter. Daniel: We think that most black holes are probably dominated by normal matter because it's harder for dark matter to fall into them. Jorge: Is the total electric charge in the universe equal to zero? How about on galaxy or planet level? I'm eager to hear your answers to my questions.

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