Gravitational Lens and Quasar PG 1115+080
Depicts: PG 1115+080
Copyright: Christopher D. Impey (University of Arizona)
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Astronomers who are using the Hubble Space Telescope (HST) to observe the gravitational lensing of light from distant quasars have discovered new evidence about the rate at which the universe is expanding.
Last Update: 1 September 2019