Is the Great Attractor part of Cosmic Black Matter? Since the Big Bang, the universe has been spreading out in every direction, and it’s picking up speed. The space between galaxies is getting larger every day. Currently, things are drifting apart at a rate of 2.2 million kilometers per hour. Now, you’d think that the galaxies to the left and the right of ours would be moving at the same velocity. You’d be wrong. What’s slowing us down are enormous clumps of matter. Matter is attracted to matter, which is why we see galaxies form into clusters and superclusters. Even so, that’s still not enough for the calculations astronomers have been getting. Somewhere out there in the most heavily veiled area of space lies a massive gravitational irregularity that has been dubbed the Great Attractor. Over the course of billions of years, it’s been pulling us and all the galaxies near us closer to it. The Great Attractor is thought to be at the gravitational center of the Laniakea supercluster—of which the Milky Way is but one galaxy of 100,000 others. One theory is that it’s a confluence of dark energy. Another is that it might be caused by over-density, an area of dense mass with an intense gravitational pull. Whatever it is, it’s powerful enough to overcome normal dark energy, the force that’s believed to push galaxies on and cause them to pick up speed as they move forward. The Great Attractor is pulling the Milky Way and all else towards it at the terrific speed of 14 million mph. What is this thing, how far away is it, and what will happen when we reach it? No one knows. The most massive possible black hole would be nowhere near massive enough to cause this effect, nor is there any super-super cluster of galaxies to account for it. We are left with the possibility of some yet unknown force. ( Extract from Philip Perry ) Dark Energy is the gravitational pull from the Cosmos. Out there in the Cosmos is mass, a great deal of stuff, sufficient to create the expansion of the universe we call Dark Energy. See Dark Energy blogs.
The large clumps of mass which make up the cosmos provide the gravitational pull of Dark Energy but there is no reason why all of this mass should be outside of our observable universe. Philip Perry is quoting given opinion that the black hole could be big enough to be the Great Attractor. The massive clumps of ‘black matter’ out in the cosmos could. We can only imagine what the black matter in the cosmos is made of. As it has the gravitational pull of Dark Energy then it could easily be big enough to be the pull of the Great Attractor. The energy of the Great Attractor is the same as Dark Energy. It's just closer to us.