>>149992981
The official Crisis Core guide claims that the characters in FF7 draw opponents into their own spaces to attack. This means those dimensions with stars in the background are actual pocket dimensions that they sustain.

Sephiroth's Supernova has a whole galaxy in it, but the dimension around it is actually much bigger than the galaxy itself (the galaxy is a little dot in the background before the camera zooms in.)
> 2atan(tan(35deg)*(13/624)) = 0.02 rad (1.6 degrees)
This galaxy is a replica of the Milky Way, 105700 light years diameter.
>105700 light years at 1.6 degrees = 3.6e+6 light year radius for the dimension.
>Hemisphere calculator on 3.6e+6 light years = 1.2e+14 square light years (total surface area.)
The Milky Way has a total surface area of 26324600000 square light years.
The energy required to destroy the Milky Way is 10.53 ZettaFoe.
> 1.23704E+14 / 26324600000 * 10.53 = 49482.3518686 ZettaFoe.

49 YottaFoe (Multi-Galaxy level) for Sephiroth.