After seeing other galaxies for the first time this Spring through a 20″ Dobsonian telescope near Big Bend (Bortle 1!), I felt compelled to understand the scale of space. Getting these numbers and ratios was extremely satisfying. There’s a pretty nice symmetry with human-scale in the middle, also it’s cool that these are all kind of circles/spheres. I definitely wonder about the extremes- subatomic particles approaching Planck Length and the size of the Universe/Multiverse.

No discussion of numbers of this sort would be complete without referencing two of my favorite books:

• Cell Biology by the Numbers, also https://bionumbers.hms.harvard.edu/search.aspx
• Spectrums