On: All of Earth's water in a single sphere (2019)

[yardstick]

This was my first thought too.

I had no idea where to start. ChatGPT had a rather impressive looking “proof of work” that put all living humans into a 976m-diameter sphere, compared to the ~1384km-diameter sphere. Ie ~1km human sphere and 1,384km water sphere.

[Zobat → yardstick]

Wolfram Alpha had "us" making a 966 m sphere.

https://www.wolframalpha.com/input?i=estimated+total+volume+...

Which has a link that gives us the radius.

https://www.wolframalpha.com/input?i=4.73%C3%9710%5E8+cubic+...