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Here's what it takes.
It's a very big number.
They're not as big as you think.
Let's hope you never cross one.
Proponents think they've found proof.
Most don't even require falling in.
Fuzzballs, MECOs, boson stars, oh my!
Scientists have suspected it for decades, and now there's some proof.
When it formed, space wasn't transparent yet.
They're basically natural Death Stars.