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Maybe someone can quickly clear up a problem I have with the possibility that gravity is mediated by an elementary particle, the Graviton, that is massless and propagates at the speed of light. As I understand it, it's considered hypothetical at the moment, meaning it's considered as one possibility. I can't see how it's possible. My reasoning is pretty simplistic. Take a black hole at the centre of a galaxy. It's gravity clearly affects the stars and materials that are orbiting it. We can calculate the mass of the black hole by how it's gravity affects everything else. But how can a boson escape a black hole, and affect the surrounding stars? As I understand it, nothing can escape a black hole. Photons are massless bosons, that travel at the speed of light, but they can't exit a black hole, so how could a graviton? Is it immune to the action of other gravitons? Is that theoretically possible? Please don't respond by saying that the existence of the graviton is not accepted theory, I already know that. The question of this OP is, can it's existence be positively discounted, for the reason I've given above? And if not, why not?

Research didn't find evidence of fomite transmission of COVID. The antiseptic industry made out like bandits, though. I suspect research will discover COVID did create a generation of germophobes, who will suffer lifelong immune impairment as a result.

No.