Is space infinitesimal? By this I mean can it be divided an unlimited number of times? If we take a 1m ruler and divide it in 2 and we get a 50cm ruler How many times can we keep doing this? (disregard that the ruler is made of atoms) So for many years I have been told that the limit is the Plank length, but I want to ask if this is this an established proven fact? Is it even possible to prove? I think there is a similar concept for time also ie plank time?