preprints.org > physical sciences > astronomy & astrophysics > doi: 10.20944/preprints202006.0217.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Version 1 : Received: 16 June 2020 / Approved: 17 June 2020 / Online: 17 June 2020 (13:11:29 CEST)

For a hierarchy of large scale structures, like galaxies, galaxy clusters, super-clusters, etc. the requirement that their gravitational (binding) self-energy density must at least equal or exceed the background repulsive dark energy density implies a universal mass-radius relation given by M/R² ~ 1g/cm². Here we point out that this mass-radius relation also holds for important individual biological structures, and even various organisms as a whole such as humans, trees, and to behemoths like whales, even though the physics is different. Here we try to understand this universality from two different physical considerations. We also point out the coincidence that the densities of most biological entities are close to that of water, and that the average density of main-sequence stars and giant planets are close to this density. We give a physical basis for the same.

Mass per area; biological structures; gravitational self-energy; dark energy

PHYSICAL SCIENCES, Astronomy & Astrophysics