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Very interesting research.
Abell 1689 (+ dark matter) causes the gravitational lensing. The greater the mass, the more the light path is curved. The deviation of light from this expected path is a measure of the expansion of space. If space is expanding, the light path needs to bend more to still reach Earth. This effectively requires an increase in the mass of Abell 1689 as compared to a static space.
Correct or not?
Regards, Rob.
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