Aage Andersen (REMOVE) wrote:
"Nick" I say space-time is a continuum and that will never change.

It is a postulate that physical space is continuos, it can never be shown
experimentally.
If it is discrete, then someone will one day measure the discreteness.

Aage

That is partially correct. Penrose, Smolin, Wheeler and others have
proposed some models that do not rely on that postulate. In the end,
the confrontation of the *predictions* of those models against
experiment will be the only thing that determines which postulates are
correct. It may not be necessary (or indeed possible) to validate the
postulate directly.

Note the parallel with one-way light-speed measurements, and how the SR
postulates replaced the earlier postulates of the independence of space
and time and absoluteness of simultaneity.

PD