[tommiegannert]

The same question scales outwards. Are there forces taking over from gravity at galactic scale? Like, perhaps the galaxy filaments and voids come about due to something we can't even comprehend. It seems unlikely that humans just happen to be working with the force at the largest "scale."

How complicated would it be for a small insect to explain gravity, if they're not normally affected by it in their daily routine?

I recently thought about something similar: it seems like at certain scales, things turn into spheres, based on applicable forces. And then there are in-between regions with chaos. Atoms seem mostly round. Humans are not. If planets and stars are at the next spherical scale, are there even larger structures out there that once again show spherical nature, once you're past galaxies, clusters and filaments?

[hnuser123456]

Since black holes grow with their radius proportional to mass (not volume), larger black holes are less dense. The current estimates for the size and mass of the universe fits right on the line of that curve of critical density.

[deciplex]

The universe itself, if bounded, might be a hypersphere.