How does the Einstein Ring discovery help test Einstein's theory of general relativity?

This Einstein Ring discovery allows researchers to test Einstein's theory of general relativity by measuring the lensing galaxy's mass in two ways: by analyzing how light bends and by observing the velocity of its stars. Einstein's theory predicts these values should be identical, making any discrepancy significant for gravitational models. When researchers calculated the mass of the lensing galaxy, they found it slightly higher than expected based on its estimated star count. This discrepancy may indicate the presence of dark matter clustering at the galaxy's center. While this finding provides fascinating insights into both general relativity and dark matter distribution, further observations of similar lenses will be needed to confirm this hypothesis.