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Is this a relativistic energy mass equivalency?
A demonstration that light is indeed affected by gravity was one of the most famous early tests of general relativity,
I was familiar with that observational confirmation of relativity, and considered the possibility that it might be the answer to this question. It is always intimidating to ask scientists what is probably a simple question.
Thanks. Always glad to read your comments.
While I'm not an expert on the history, I have heard that the fact that energy gravitates really surprised physicists of the time. Apparently Einstein and others initially expected general relativity (or, really, a Lorentz-invariant theory of gravity) to be a trivial extension of special relativity (a Lorentz-invariant theory of electromagnetism). The fact that energy gravitates is a major reason this is not the case.