Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | September 2024
Sean Carroll
Well, they're things that are very closely related to things that exist. Black holes do exist. But the problem with black holes as dark matter is it's very hard to get the right abundance of black holes with the right masses so that we haven't already ruled them out. It's very hard to get the right abundance at all.
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