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" ... Because of the way things mix, we get two physical and one unphysical gluon out of the equation, for a total of eight. ... "
" ... If we started astrophysics all over again, with no historical baggage, we would not re-implement this system. We would probably use something much more uniform and logical as our “rough” coordinate system, rather than this rather interesting, but utterly unphysical system we have today! ... "
" ... In a sense, you’d just have empty space itself: still expanding, still with the laws of physics intact, and still with the inability to escape the quantum fields that permeate the Universe. This is the closest you can get, physically, to a true state of “nothingness,” and yet it still has physical rules it must obey. To a physicist in this Universe, removing anything else will create an unphysical state that no longer describes the cosmos we inhabit. ... "
" ... Sure, it's fascinating, but visualizations, based on a mix of science and artistic license, have been around for as long as we've even known enough about science to imagine what could realistically be. Also, side note, the "interstellar" black hole is probably not very likely to be what we see when we examine our realistic black holes in supreme accuracy; there's a lot of artistic license and some likely unphysical assumptions that were made for Insterstellar. ... "