OTHER WAYS TO MEASURE THE HUBBLE CONSTANT
May 29, 2019
2 minutes
The light from remote galaxies and quasars can be split into multiple images by the gravity of a massive foreground object, such as a huge elliptical galaxy or a galaxy cluster. Brightness changes in the lensed object (for example, a supernova explosion in a galaxy, or the temporary flickering of a quasar core) arrive at Earth at different epochs, because each light path
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