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I remember reading this book in a library around 2011. I suspect it was probably decently old at the time.

A central point involves a tiny black hole on the surface of an alien planet. I have a mental image of something about the size of a basketball, but don't remember if its size was actually explicitly stated. I also think it had some religious/ceremonial significance to the beings living there. Eventually the protagonist, a boy, approaches and enters the black hole, and witnesses time dilation of the outside world along the way. Inside the black hole is like a wormhole, with multiple different entrances/exits.

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    A basketball sized black hole has approximately the mass of Saturn. The planet would be within the black hole's Roche limit and break apart.
    – Spencer
    Commented Feb 8, 2023 at 22:48
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    @Spencer Irrelevant to the question.
    – chepner
    Commented Feb 8, 2023 at 22:53

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