https://phys.org/news/2024-12-distant-blazar-discovery-rapid-black.html

Astronomers have discovered an important piece of the puzzle of how supermassive black holes were able to grow so quickly in the early universe: a special kind of active galactic nucleus so distant that its light has taken more than 12.9 billion years to reach us. This so-called blazar serves as a statistical marker: its existence implies the presence of a large but hidden population of similar objects, all of which should emit powerful particle jets.

originally posted at https://stacker.news/items/817524