The Plot of All Objects in the Universe

posted by Jason Kottke Sep 26, 2023

a scientific plot of all of the objects in the universe

You just have to admire a chart that casually purports to show every single thing in the Universe in one simple 2D plot. The chart in question is from a piece in the most recent issue of the American Journal of Physics with the understated title of "All objects and some questions".

In Fig. 2, we plot all the composite objects in the Universe: protons, atoms, life forms, asteroids, moons, planets, stars, galaxies, galaxy clusters, giant voids, and the Universe itself. Humans are represented by a mass of 70 kg and a radius of 50 cm (we assume sphericity), while whales are represented by a mass of 10^5 kg and a radius of 7 m.

The "sub-Planckian unknown" and "forbidden by gravity" sections of the chart makes the "quantum uncertainty" section seem downright normal — the paper collectively calls these "unphysical regions". Lovely turns of phrase all.

But what does it all mean? My physics is too rusty to say, but I thought one of the authors' conjectures was particularly intriguing: "Our plot of all objects also seems to suggest that the Universe is a black hole." Huh, cool.