They may alter by, oh, .0000000001 or way less than that, say, when a galaxy cluster explodes or something. Which even if true may be essentially impossible to

They may alter by, oh, .0000000001 or way less than that, say, when a galaxy cluster explodes or something. Which even if true may be essentially impossible to notice given Planck. So how do we know what's going on at that level? We can't explode galaxy clusters. And maybe there are thousands of layers even below that; you'd need gajillions of universes exploding / collapsing to notice the trend of some sub-Planckian thing happening statistically per universe. And maybe even thousands of layers below that. Or maybe not.