There are several ways that surface gravity on Earth could change. We wouldn’t like most of them. If a mini black hole collided with Earth and didn’t pass straight through, it would sink to the planet’s centre. Gravity would soar as the entire planet is pulled into the hole. It would probably get very hot too, so no one would survive to see the final spaghettification as we got within a few kilometres of the hole, when we are pulled apart by intense gravity gradients.
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