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"Another possibility is that these things are a different kind of weird object, such as faint quasars, which would be just as interesting."
A survey of distant quasars gravitationally lensed by closer galaxies calculated the Hubble value at six different redshift distances.
Source: https://phys.org/news/2023-09-early-dark-energy-hubble-tension.html
In 1963, Dutch astronomer Maarten Schmidt discovered quasars, beacons at the edge of the universe pumping out 100 times the energy of a normal galaxy.
Source: https://www.theguardian.com/science/2023/mar/19/explaining-the-universe-one-small-step-at-a-time
They found what they describe as “the presence of distorted structures” in the galaxies that contain quasars.