[zamalek]

One of the the few times where the inverse square law is helpful.

[hexane360]

Reminds me of this: https://what-if.xkcd.com/29/

What's lethal at 3 inches probably isn't measurable at 50 feet.

[drjesusphd]

It's helpful all the time, since it allows stable orbits.

https://en.wikipedia.org/wiki/Bertrand%27s_theorem