quasar

noun

qua·​sar ˈkwā-ˌzär 

also -ˌsär

: a region at the center of a galaxy that produces an extremely large amount of radiation

Examples of quasar in a Sentence

Recent Examples on the Web

Those same atoms, molecules, and/or ions absorb the light from behind them — whether from a quasar, a background galaxy, a star, or from the continuum — revealing those same characteristic quantum transitions. —Big Think, 19 Nov. 2025

These results are in line with previous infrared observations of quasars, feeding supermassive black holes that glow brightly due to vast emissions of energy from material surrounding the black hole. —Robert Lea, Space.com, 14 Nov. 2025

After the detection of hydrogen, astronomers discovered previously unknown types of stars, such as pulsars and quasars. —Gabriela Radulescu, The Conversation, 4 Nov. 2025

The universe is overwhelmingly made of matter, which is responsible for visible structures ranging from atoms to galaxies, and quarks to quasars. —Chris Young, Interesting Engineering, 23 Oct. 2025

Word History

Etymology

quasi-stellar

First Known Use

1964, in the meaning defined above

Kids Definition

quasar

noun

qua·​sar ˈkwā-ˌzär 

also -ˌsär

: any of the very distant starlike heavenly objects that give off very strong blue and ultraviolet light and powerful radio waves