# Black hole questions

**URL:** <https://boards.straightdope.com/t/black-hole-questions/274442>\
**Category:** Factual Questions\
**Created:** [November 12, 2004, 8:15pm UTC](https://boards.straightdope.com/t/black-hole-questions/274442 "2004-11-12T20:15:59Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![marshmallow](https://avatars.discourse-cdn.com/v4/letter/m/df705f/32.png) [@marshmallow](https://boards.straightdope.com/u/marshmallow)\
**Post date:** [November 13, 2004, 7:33am UTC](https://boards.straightdope.com/t/black-hole-questions/274442/21 "2004-11-13T07:33:18Z")

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Those were some nice links, thanks.

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**Author:** ![chrisk](https://avatars.discourse-cdn.com/v4/letter/c/6de8d8/32.png) [@chrisk](https://boards.straightdope.com/u/chrisk)\
**Post date:** [November 13, 2004, 12:55pm UTC](https://boards.straightdope.com/t/black-hole-questions/274442/22 "2004-11-13T12:55:20Z")

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> [@snailboy](#):
>
> As for a marble-sized black hole sucking up Earth, it would almost certainly happen. Part of the reason is explained above. It would exert a lot of gravity on anything nearby, far more than just an inch or two. Plus, since the core is liquid, it would basically flow into the black hole. And without the core, I would be very surprised if the mantle and crust didn’t collapse.

Hi snailboy!!

Any guesses as to how much of the earth a black hole starting with the mass of a large mountain (if such a hole is possible) would be able to suck up?? Also, any guesses on how large its event horizon would be? I like math, but I got lost in the equations to compute a swarzchild radius. (For one thing, I wasn’t sure how to start computing the number of kilograms in a mountain.)

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