Astronomy

Oh that's weird! I can see the picture. I wonder what instance you're on? I'm on kbin.social. We should let the admins know that linked pictures aren't coming through.

And the answer to your question is: Not all gravitational influence is orbiting! "Attracted by" doesn't necessarily imply orbiting, and yes your link is absolutely correct that these superclusters are not and never will be orbiting one another. But they are affected gravitationally.

It gets a little weird to think of at this point, but think about that object that passed us a while back called Oumuamua. It's believe to be from a completely different solar system, and yet managed to leave the orbit of that solar system and fly past us. So our sun definitely affected it gravitationally, but not strongly enough to pull it into orbit and it's flying away from our solar system now.

To understand these things, you have to change the way you think about what gravity is. You can think of gravity less as a "force" and more as the effect that massive objects have on space itself, warping and bending the shape of space. This creates sort of 3-D "hills" and "valleys" where gravity is weaker or stronger. And objects traveling through space *including photons of light" flow along those ripples, bending in the general direction of an area of a high concentration of mass and away from areas of low concentration of mass.

On the greatest cosmic scales like these superclusters, we see a general flow of massive objects along a similar trajectory, both caused by and causing these mind-bending super structures. Everything is influencing everything else because it's bending space itself.

Here's the source of the picture I posted, they describe these structures as gravitational water slides, which I think is adorable lol: https://skyandtelescope.org/astronomy-news/cosmic-void-pushes-milky-way-3001201723/

https://en.m.wikipedia.org/wiki/Great_Attractor

https://youtu.be/XRr1kaXKBsU

https://youtu.be/0w4OTD4L0GQ