On the Science Channel, US cable TV (7/11/2011): A NASA astronomer has discovered that a number of galactic clusters are all UNEXPECTEDLY drifting in a uniform manner (not directly away from earth) suggesting that something is attracting them all in a particular direction. [The astronomer was SHOCKED when he saw the data and initially did not believe it himself.] An English theoretical physicst heard about the observations: She has a theory about a nearby parallel universe attracting matter in our universe...and her calculations match the observations from NASA! They have teamed up for further study and the NASA astronomer hopes to have some 2,000 galactic cluster drifts documented during the next two years. [According to the program, this "drift" is currently disputed by others.] I happen to be rereading Michio Kaku's Hyperspace (1994) and noticed this comment about Hugh Everett's many worlds theory: So I am wondering if anyone can point me to some discussion of the drift and or explain any details. And I am wondering if Kaku's comment is now out of date and if so why do we believe gravity can pass between parallel universes. All I have read is that it has been theorized that gravity may be weak in our universe because maybe it leaks into the curled up dimensions in string theory. (Sorry I don't have the physicsts names..) Thanks.