I've been giving some thought to the new scientist article about the equivalence principle. What initially seems like a very simple issue is remarkably tantalising. (please note- I'm not a physicist so this may be quite stupid) This led me on a little to the question of gravity and direction and my train of thought leads to the question : Has anyone calculated or done any work relating the the total pull of gravity of the universe entirely ? Especially from the point of view - Does it have a direction? Could such a thing be calculated. This sounds like the "is the expansion uniform" question but I think maybe its somewhat different.