On the Atomic Think Tank forums for Mutants and Masterminds one of the posters was soliciting ideas for the names of space prisons. I threw a few ideas out there, but now that I did, I really, really like one of them that I came up with:
The idea is that the Rock is out of phase between two dimensions. The only way to enter the prison is with a special device to attune the visitor to the exact point between the two dimensions where the prison fully exists. Schrodinger's Rock appears as a ghostly fortress on both dimensions that it phases between, but cannot be interacted with without the proper device.
Now that I came up with this idea, some day I have to use it. Perhaps it sucks and I'm just enamored of it because it's late at night and my judgement is lacking.