The sun is enormous, yeah, but fusion only really happens at the core. A very tiny fraction of the sun is doing the fusion, the rest jlgets heated up, makes gravity and such, bit doesn't really do anything of interest energy wise.

Fusion creates a shit tonne more energy than 150w/cm3. Heck, you've never seen what a nuke does

[–] CanadaPlus@lemmy.sdf.org 1 points 1 hour ago* (last edited 1 hour ago)

No, OP is right - or rather, OP's physics professor. There's different kinds of fusion, though, and nobody's suggesting we do the exact same kind here on Earth (we basically can't).

Fusion creates a shit tonne more energy than 150w/cm3. Heck, you’ve never seen what a nuke does

That's power density (Watts). Multiply by 10 billion years to get energy density.