Density of Kerbium

[ZetaX]

You only need black holes smaller than planets

That will be easy.

By the way, if you do it that way, then you have to deal with higher pressures than with the real versions. And the problem how that black hole stays in the center.

[Findthepin1]

Black holes? That might explain how a celestial object doesn't move no matter what we do to it, why they're on rails. The part we're knocking around isn't actually in contact with the vast majority of said object's mass.

[ZetaX]

Black holes? That might explain how a celestial object doesn't move no matter what we do to it, why they're on rails. The part we're knocking around isn't actually in contact with the vast majority of said object's mass.

That's not how it works. You would very definitely see effects of that.