Dark Flow From Other Universe Engulfing Galaxy Clusters

"The source of this attraction is doubted to be present outside our observable universe." Great ! Then it's got to be within reach, let 'em tell us what and where it is.

There seems to be some disjoint...

"The Galaxies are moving away from each other because of expanding universe which is now well accepted concept."

and

"... the galaxy clusters are constantly moving towards a point present in southern constellation Centaurus and Hydra."

As in the Hydra-Centaurus Supercluster? If yes, the Great Attractor IS believed to be outside the observable universe... has been, anyway. Is there some doubt now?

Thanks for the clarification Jorrie. Yes, I misspoke when I said 'in the Hydra-Centaurus Supercluster.'

Your comment "That is, if the effect is real, not just an artifact of data analysis, (perhaps) cluttered by observational noise." seems particularly applicable.

Did you mean radius or diameter?

If the radius is 46 billion Light years would that not make the universe much older?

Radius, with us at the center.

The 'oldest light' we observe (the CMB radiation) came from a sphere of some 41.2 million ly radius around us (when the photons were emitted). Due to the expansion, it took ~13.8 billion years for those photons to reach us. That same region is presently some 45.4 billion ly from us and no "new light" from there will ever reach us.

Take a look at my old Cosmo-calculator...

-J

Excuse my ignorance. Just lightly thinking would that mean that there is more out there where we just missed the oppurtunity of seeing past the current visible end of the universe? With other words the universe in the beginning was light and is slowly darkening because the light sources are outrunning the speed of light and we simply can not see them anymore?

How do we judge the size of the universe again when we base it on what is visible?

Will have a look at the calculator later but what I have seen it is over my top. . .

Later!

Thanks!

It at the first glance looks like we are looking back in time and not into space.

Need to comprehend this one!

If we could instantly transport ourselves to a region 45.4 billion light years from here, what would we see?

What an interesting question!

As Jorrie's tagline says, "Perplexity is the beginning of knowledge." -- Kahlil Gibran

"If we could instantly transport ourselves to a region 45.4 billion light years from here, what would we see?"

Good question, but we will most likely see something similar to what we see here today, with only small scale differences. There are no guarantees, though...

The "instantaneous traveler" should definitely be able to see a tiny patch of the CMB radiation that represents our present position as it was at the time of the CMB emissions, almost 13.8 billion years ago.

If the homogeneous and isotropic principles hold, we should see the same almost uniform CMB all around.

-J

That makes sense. Now, if the cosmos is in fact infinite, what would we see if we were to increase that distance to some arbitrarily large value, say, a trillion light years?

I would put my money on something substantially different. Our one-of sample does not warrant the assumption that our observable universe holds to "infinity". If "dark flow" holds up to scrutiny, it will already indicate some super-scale inhomogeneity.

-J

That's my take as well. Thanks.

- em2

A teleport station ?

FedEx.

Exactly correct.

As Neil DeGrasse Tyson pointed out in his Cosmos re-imagining, the universe is so big, there's a lot of it we can't see because the light from there hasn't been able to reach Earth yet. So the 'known universe' (or 'observable universe') is only the portion we can see, and we can only guess at what lies out in the far reaches based on what its gravity is doing to the closer objects on this side of the 'veil' (for lack of a better term).

All we can to to find out for sure is wait for the 'veil' to move further out as the light of the incredibly distant galaxies finally reaches us, or hop in the Spaceship of the Imagination and speculate about what we'll find based on what we've seen so far.

(On a side note, I think Tyson's SotI was a lot cooler looking than Sagan's. I know they had limited special effects capabilities back then, but that Sagan's 'spaceship interior' set looked a lot like a church interior with all those peaked arches guiding the viewer's gaze to the viewscreen. I'm not knocking religion, but science it not an entity that is supposed to invoke blind worship. Science is there to be questioned, explored, attacked even. Ideas that prove to be false under scrutiny are discarded and replaced with ideas that better explain the observed phenomena. Ideas that stand up to the latest attempts to disprove then are considered stronger/more complete answers, at least until the test comes along that CAN disprove it and show us the hidden layer, the subtle details, we didn't even knew existed before then.)

As the Universe is expanding and (evidently) this expansion is accelerating, there is also a future horizon beyond which light from this region will never reach us.

It's the GlobalSpec effect...

...darkness comes from without

That article is a mess.