Whereas in science fiction, the assumption is that no matter how extraordinary the power is, it's nonetheless rooted in the normal laws of the universe and can be achieved by anyone with sufficiently advanced technology or sufficiently evolved mental ability.
In the TNG episode True Q
, Q to test Amanda Rogers causes a warp core breach.
When the staff attempts to analyze what happened, LaForge comments that, "the laws of the universe simply weren't functioning properly."
Q pops in
and comments, "why shouldn't they - they're so inconvenient."
So, the Q seem to be able to modify universal constants.