Physics & Quantum
Quantum Foam: The Theory That Spacetime Itself Is Froth—and How Astronomers Test It
Quantum foam theory posits that spacetime is not smooth but a turbulent froth at the smallest scales, a concept tested by observing how high-energy light travels across vast cosmic distances. Astronomers use distant quasars and gamma-ray bursts to place limits on this theoretical 'foaminess' of spacetime.
Aram Sarkisian·June 23, 2026
