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RE: What becomes of a PHOTON which does not Strike any Substance ??
It keeps traveling at the speed of light indefinitely until it interacts with something. This actually what the cosmic microwave background radiation is all about, which is light (photons) that scattered shortly after the bigbang and has been traveling ever since, then got picked up by our instruments and we drew the CMB map from it.
So to answer your question, it doesn't have an impact unless it's "measured".
Thanks for the Elucidation. But i suggest "....after the BEGINNING would have been preferred to ....after the "BIG BANG"...it being a mere THEORY.😀😀
My pleasure. Saying the "begining" in this case is no different than saying the "big bang" as both words are describing a "theorized" inflationary event we are talking about, however the "big bang" event isn't necessarily really the begining. So using the big bang to name that event we are talking about would be more accurate 🙂