Supermassive Black Hole - Fermi Finds the Farthest Blazars - Quasar - NASA
The Brightest Quasar of the Early Universe Shines with the Light of 600 Trillion Suns
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The Whole Earth Blazar Telescope (WEBT) is an international consortium of astronomers created in 1997, with the aim to study a particular category of Active Galactic Nuclei (AGN) called blazars, which are characterized by strong and fast brightness variability, on time scales down to hours or less.