* Quasars are not stars: Quasars are extremely luminous and distant objects powered by supermassive black holes at the centers of galaxies. They are not stars, which are self-luminous balls of hot gas.
* Radio emission: Some quasars emit a significant amount of radiation in the radio part of the electromagnetic spectrum. This is due to powerful jets of particles ejected from the black hole, interacting with surrounding matter.
* "Radio source" not "radio star": The term "radio star" can be misleading. Astronomers refer to quasars as "radio sources" when they emit a strong radio signal.
In summary: While some quasars are strong radio sources, they are not called "radio stars". They are incredibly energetic objects powered by supermassive black holes and are fundamentally different from stars.
