James Webb Space Telescope complicates expanding universe paradox by checking Hubble's work

A visual showing various galaxies in pink and blue getting smaller as they go deeper into the image. There's a ladder tracing them all togther.

The James Webb Space Telescope (JWST) has double checked the work of its older sibling, the Hubble Space Telescope. Hubble's measurements of the expansion rate of the universe are exemplary, the trailblazing observatory found, further ratcheting up the so-called "Hubble tension."

Putting it simply, measurements of the expansion rate of the universe, defined by a property called the Hubble constant, just don't add up.