faunablues wrote:If [...] the smaller objects are moving a little faster
faunablues wrote:(if we see the big bang as an explosion, [...]
Hubble's law shows that the velocity at which distant objects are moving (almost) directly away from us is (roughly) proportional to the distance between us and them. Regardless of their mass. This fact, and some geometry, shows that every distant object is moving directly away from any reference point you'd care to name.
I'm not familiar with the details of the paper mentioned in the comic, but I guess it means that the "almost" and "roughly" in the previous paragraph are out by an amount such that they indicate a gravitational attraction to an object even more distant, such that we can't see it. Or something along those lines. If someone has a more specific link (or even the name of the paper... "this A.S.T. paper" isn't enough to get useful results from Google) I'd be a happy man.
Acutally, now that I think about it, does the idea of an object outside the visible universe affecting an object within the visible universe even make sense? Or does the term "visible universe" in this context mean something different to the "theoretically-observable universe"?