Thinking about how little we know even about the amount of mass in our own solar system (Oort Cloud etc), could the discrepancies in mass simply be a ton of space junk (asteroids, planets etc) and even objects like cold neutron stars that are all very explainable objects in terms of their...
I agree with the approach taken here. The most dangerous conjecture so far was taking one single baffling iteration of an experiment as possible (fine if we are to construct a road map) and dumping a whole bunch of extraordinary results on top of it. We jumped straight to photons have mass on...