6 days ago · Scientists tried to break Einstein’s speed of light rule Einstein’s speed-of-light rule just survived its toughest cosmic stress test yet. Date: January 8, 2026 Source: Universitat …

Nov 20, 2025 · Michelson and Morley’s inability to measure any variation in the speed of light pointed to a deeper truth: the speed of light is always the same, regardless of motion. It’s this …

5 days ago · Scientists are putting Einstein's claim that the speed of light is constant to the test. While researchers found no evidence that light's speed changes with energy, this null result …

Jan 8, 2026 · A new study pushed Einstein's speed of light rule to its limits using cosmic gamma rays, reinforcing a fundamental principle of physics.

Their results *show no violation* of Einstein’s rule, but they significantly tighten the constraints on where new physics could be hiding.

The Legacy of Lorentz Invariance The search traces its roots back to 1887, when Albert Michelson and Edward Morley tried to measure changes in light speed that would reveal the …

Jan 8, 2026 · Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest …