I'm starting to think that cosmologists are truly in the dark about what's really going on in our Universe.
But it's intriguing anyhow.
A large are of the sky is affected by it: galaxies in that zone are moving at incredibly high speeds ("a million miles per hour") apparently towards something that is beyond our horizon (that is: farther than 13.5 billion light years, which is the age of the Universe). The opposite sense of the motion is not totally ruled out but seems quite less likely.
More details at Science Daily.
So what is it? Is it some sort of sink hole by which this universe gets lost into some other universe (of whichever number of dimensions)? Is it the coalescing big crunch, the super-huge-macro-giga-ultra-giant black hole that would suck the universe in order to create a new Big Bang in a parallel reality (time only seems to exist within our universe, not clearly outside it)? No damn idea!