Has it been observed? Is it just theoretical? Is it one of those simple-but-profound things?
EDIT: I really appreciate all the answers, everyone! I do photography. Please accept my photos as gratitude for your effort and expertise!
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Fun and slightly tangential fact: Proton mass is not absolute and does vary (veeery slightly) depending on the element. The closer it comes to iron, the more stable it becomes and the lighter it becomes as it sheds mass into energy. Heavier elements that decay towards being a proton shed some of that mass into energy, and lighter elements that fuse release mass into energy
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