These Are The Last Galaxies That Will Remain In Our Night Sky
“But beyond our backyard, all the other galaxies, groups, and clusters are accelerating away from us.
Once you go about 4-5 million light years away, dark energy causes space to expand faster than gravity attracts other objects across space.
Over time, every other galaxy will see its distance and recession speed increase from our perspective.”
Our Universe isn’t only expanding, but is accelerating. This means that every galaxy, group, or cluster that isn’t already gravitationally bound to us is receding from us at a faster and faster rate as time goes on. With 2 trillion galaxies in the observable Universe, only approximately 70 of them are bound to our Local Group. Everything farther than about 4 or 5 million light years away from us is unbound, and therefore will recede from us forever and ever, with their recession speeds and cosmic distances increasing over time.