It’s a powerful technique, but small uncertainties at each step can add up, something critics argue may be behind the Hubble ...

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

Current physics is speeding toward a breaking point, as astronomers confirm that the Hubble tension in new data.

Occasionally there are physics lab demonstrations that I think are pretty awesome but that my students just think are "meh." This is one of those cases. The basic idea in this demo, which I used in my ...