"Galaxies' Motion Suggests a Younger Universe"

The motions of satellite galaxies in galaxy groups suggest that the universe might be younger than previously thought, challenging the Standard Model of cosmology. Observations of pairs of satellites in galaxy groups indicate that the universe could be younger than the 13.8 billion years estimated by the Planck mission. This discrepancy may also relate to the "Hubble tension" problem, which arises from conflicting measurements of the universe's expansion rate. The findings, published in Nature Astronomy, imply that some assumptions about the universe may be incorrect, potentially pointing to the need for a reevaluation of the Standard Model and our understanding of dark matter.