: a region at the center of a galaxy that produces an extremely large amount of radiation
Examples of quasar in a Sentence
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This quasar existed when the universe was less than 1 billion years old, and its central engine is a supermassive black hole with around 12 billion times the mass of the sun.
—
Robert Lea, Space.com, 20 Feb. 2026
The team spotted the distant quasar, an actively feeding supermassive black hole, using observations from the Subaru Telescope.
—Georgina Jedikovska, Interesting Engineering, 23 Jan. 2026
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
After the detection of hydrogen, astronomers discovered previously unknown types of stars, such as pulsars and quasars.
—Gabriela Radulescu, The Conversation, 4 Nov. 2025
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Robert Lea, Space.com, 20 Feb. 2026
The team spotted the distant quasar, an actively feeding supermassive black hole, using observations from the Subaru Telescope.
—Georgina Jedikovska, Interesting Engineering, 23 Jan. 2026
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
After the detection of hydrogen, astronomers discovered previously unknown types of stars, such as pulsars and quasars.
—Gabriela Radulescu, The Conversation, 4 Nov. 2025
See All Example Sentences for quasar
Cite this Entry
“Quasar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quasar. Accessed 28 Feb. 2026.
Copy CitationKids 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
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