| Not necessarily.
Since we don't really have much current physics evidence to say how much energy is required to cross between the current 4 dimensions into the other 7/11/etc (depending on current theory) of the regular universe, it is difficult to say if the SG-1 universe is any different.
Similarly who can possibly say how much it takes to find an alternate universe. There are no large power sources for the mirror on P3R-232, so it can't take THAT much energy. |