The light output from some quasars varies in just a few hours.

Name: The light output from some quasars varies in just a few hours.
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Quasars, which are extremely luminous active galactic nuclei, can indeed show variability in their light output over short timescales, including just a few hours. This variability is thought to be due to changes in the accretion rate of material onto the supermassive black hole at the quasar's center or due to relativistic jets pointing close to our line of sight.

The Light Output from Some Quasars Varies in Just a Few