James Webb Telescope Confirms Universe's Faster-Than-Expected Expansion

New observations validate Hubble's findings, deepening the mystery of the 'Hubble tension' and hinting at unknown physics shaping the cosmos.

The James Webb Space Telescope has independently confirmed the Hubble Space Telescope's measurements of the universe's expansion rate, known as the Hubble constant.
Both telescopes report an expansion rate of approximately 73 km/s per megaparsec, conflicting with the 67-68 km/s predicted by the Standard Model of cosmology.
This discrepancy, called the 'Hubble tension,' suggests gaps in our understanding of fundamental physics, potentially involving dark energy or unknown cosmic phenomena.
Researchers used three methods to measure distances to galaxies, achieving precision with less than 2% uncertainty, ruling out measurement errors as the cause of the tension.
The findings open the door to new theories, including early dark energy, exotic particles, or changes in fundamental constants, as scientists work to solve this decade-long puzzle.