The Great Attractor

Your imagination.

Google: Great Attractor

The Virgo cluster lies some 50 million light years from Earth. Only the central region is shown above, containing two giant elliptical galaxies, M84 and M86. The visible part of the cluster is but a small portion of what seems to be out there. Nevertheless, the Virgo Cluster, along with several other large clusters, are in turn speeding towards a gigantic unseen mass named The Great Attractor.

Here is a link that shows the "great attractor" is probably just a giant cluster of galaxies.

Here is some of the explanation:

X-ray observations with the ROSAT satellite then revealed that Abell 3627, a previously known cluster of galaxies, was much more massive than originally suspected, containing many more galaxies. Optical astronomers had missed a great number of galaxies, because of the obscuration, but with hindsight (and with better observations), could spot many more galaxies. It is now thought that the Great Attractor is probably a supercluster, with Abell 3627 near its center.

Thanks for shedding a little light(x-ray)on the subject!