>According to our best current model, no, the laser beam will never stop passing by matter, of approximately the same average density as the matter we can see.
I didn't understand this part, why would the laser beam would never stop passing by matter? Because of the metric expansion of the universe? Isn't it reasonable to assume that there is a skirt of the universe where matter keeps expanding into nothingness?
I didn't understand this part, why would the laser beam would never stop passing by matter? Because of the metric expansion of the universe? Isn't it reasonable to assume that there is a skirt of the universe where matter keeps expanding into nothingness?