Imagine a lets say sphere the size of an atom or so, somewhere in deep space, without any matter in it, just a mathematical volume of 3d space. Or a 1000x bigger if it would make a difference, for that matter. What can one expect to find or detect passing through it, in it in some period of time, lets say, one day? Even in single moment one should be able to collect complete picture of universe as we see it, right? With some time, all 'visible' stars, to great details and zooms? Almost all images from Hubble, complete and detailed maps of earth, sun and moon? Side note: Is there a limit to information we can get about visible universe, so that not matter how advanced optic apparatus we put inside our sphere we could only get that much information that entered our sphere? I presume there is a finite number of photons that passes through. What about other EM radiation in higher frequencies? What about other stuff? Gamma rays? Neutrinos? Gravity waves? Or some other particles or waves? And in longer time? Let's even suppose we know them all, I would guess list would not be short, or? Seems to me that in every tiny tiny part of 'nothingness' there is whole bunch of stuff going in all bunch of directions, most of it going around speed of light either. Now, do we know to reasonable extent that none of things going on in that chunk of space would interfere in one way or the other with 'matter' by changing it's momentum or any gravitational laws? If matter creates gravity which can affect light, why light, which really is everywhere, is not supposed to affect matter by same means, as a reaction force?