There Are No Superclusters

Ethan Siegel at Starts With a Bang has a nice post on superclusters of galaxies. You can also leave comments at the synopsis on Science Blogs.

The basic idea of the post is that while people often talk about superclusters, they don’t really exist as structures in the universe. Much like constellations, they might be a convenient way to talk about what we see in the sky but have no existence outside our own minds. This is because superclusters are so large that in the context of an accelerating, dark energy dominated universe, they probably can’t be gravitationally bound.