[nine_k]

I don't know about any experimental proofs that either time or space is definitely discrete, or definitely continuous.

Both Planck length and Planck time are way too short for current experimental techniques.

[sweetheart]

Slightly unrelated but your comment led me to actually learning what the Planck length is, and the Wikipedia article for it has a great section on how to visualize it [1].

Figured others might enjoy this!

1. https://en.wikipedia.org/wiki/Planck_length#Visualisation