"Scientists have never seen a black hole, because nothing, not even light, can escape them."
https://www.livescience.com/33602-particles-escape-black-holes.html
"supermassive black holes consuming stupendous amounts of gas and radiating vast amounts of energy across the spectrum as a result."
"Quasars are extremely bright and extremely distant objects. Their huge energy output is thought to be due to activity around the central supermassive black hole in young galaxies, near the edge of the observable universe."
https://earthsky.org/astronomy-essentials/definition-what-is-a-quasar/
"Known as relativistic jets, these enormous and powerful streams of particles emit light that we can see with telescopes. Although astronomers have observed the jets for decades, no one knows exactly how the escaping particles get all that energy."
https://www.space.com/43151-how-particles-escape-black-holes.html
"A black hole’s “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos. Matter and radiation fall in, but they can’t get out."
https://www.nasa.gov/vision/universe/starsgalaxies/black_hole_description.html
"The speed of light squared is a colossal number, illustrating just how much energy there is in even tiny amounts of matter."
https://science.howstuffworks.com/science-vs-myth/everyday-myths/einstein-formula.htm
"In astronomy, superluminal motion is the apparently faster-than-light motion seen in some radio galaxies, BL Lac objects, quasars, blazars and recently also in some galactic sources called microquasars. Bursts of energy moving out along the relativistic jets emitted from these objects can have a proper motion that appears greater than the speed of light. All of these sources are thought to contain a black hole, responsible for the ejection of mass at high velocities. Light echoes can also produce apparent superluminal motion.[1]"
https://en.wikipedia.org/wiki/Superluminal_motion