About 8.8x10^39 J or High 5-A, but this is before considering that there’s not enough mass in the entire Earth to create a stable neutron star before the core just explodes. That would just be the required energy amount to reduce it in density to that of a Neutron Star. Actually producing a stable object would be orders of magnitude more expensive; the world engine would need to be adding like a dozen solar masses to create what amounts to a
TZO. Just for fun though, it would be around
1.68x10^48 J (Solar System level) and would turn Earth into a cool red supergiant, which is sort of contradictory to the whole ‘Kryptonians can’t live on a red star’ thing.
If you were to fiddle with the numbers to get white-star temperatures (to produce the ‘color’ of white, which our own sun has, as it only appears yellow due to atmospheric filtering) so that Kryptonians could just live on it you would get a similar result though, so 4-B at highest ends. Even then this wouldn’t be a ‘planet’ though, just a complex star. So the plot elements would really just make the lower end feasible.
, so i think its fine.
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