Fundamental Physics
Is spacetime continuous or discrete?
UNKNOWNimportance 68/100 · Unknown
Whether space and time are smooth at every scale or have a smallest grain near the Planck length.
Current explanations
Loop quantum gravity suggests discreteness; string theory keeps a continuum with a minimal length scale; the question is tied to quantum gravity.
Research progress
No experiment yet probes the Planck scale directly; some astrophysical tests constrain certain discreteness models.
Candidate hypotheses (0)
No hypotheses are linked to this question yet.