SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/astro-agn-central-engine

What central engine defines an active galactic nucleus?

An AGN is powered by an active supermassive black hole.

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  1. An active supermassive black hole ✔
  2. A dense open star cluster
  3. A single pulsating star

Why: An AGN is the energetic center of a galaxy where a supermassive black hole is actively interacting with surrounding material. It can radiate across the electromagnetic spectrum.

Huh, didn't know that: Inactive black holes can be difficult to detect because the black hole itself emits no light.

The dad joke
The galactic nucleus became active after adding a massive black coffee.
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References

Answer: An active supermassive black hole. An AGN is the energetic center of a galaxy where a supermassive black hole is actively interacting with surrounding material. It can radiate across the electromagnetic spectrum.

  1. What Are Active Galactic Nuclei? science.nasa.gov/mission/webb/science-overview/science-explainers/what-are-active-galactic-nuclei
    active galactic nuclei are now understood to be active supermassive black holes at the center of galaxies
    Checked 2026-10-10.

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