Literally Einstein. e=mc^2
Essentially this means mass *is* energy. Like, super dense energy. Well, actually there isn’t much energy in one single atom (which has mass).
However, within say a single handful of a very dense element is an unfathomable amount of atoms.
From there you just have to ask if mass is energy, can you get it out somehow? Maybe splitting atoms apart? Let’s try that. Or maybe fusing them together, like the sun does?
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