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basafish OP t1_j1pob7t wrote

Isn't that practically limitless? I mean if we nuclear-fissioned Jupiter, we'd get all the energy we need for millions of years.

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Eur1sk0 t1_j1pwylq wrote

Nope, nothing is "limitless" because a percentage of all energy conversions is converted to thermal energy which cannot be harnessed, it's lost as we say. That's why it's not possible to build a perpetual motion machine. There are thermodynamic restrictions.

Check Kardashev scale.

https://en.wikipedia.org/wiki/Kardashev_scale

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