Gravitational lens gives us a third estimate of the Universe’s expansion
Lensed images of a supernova appear at different times.
Hubble Constant, a measure of how quickly the Universe is expanding. We've measured it using information in the cosmic microwave background and gotten one value. We've measured it using the apparent distance to objects in the present-day Universe and gotten a value that differs by about 10%
Now, researchers have managed to make a third measurement
https://arstechnica.com/science/2023/05/gravitational-lens-gives-us-a-third-estimate-of-the-universes-expansion/ #GravitationalLens #universe #expansion #supernova