radio galaxy

noun

: a galaxy that is a powerful source of radio waves

Examples of radio galaxy in a Sentence

Recent Examples on the Web
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This allowed astronomers to trace supermassive black hole jets, which could be important in understanding how this injection of energy influences the evolution of host galaxies, while also uncovering some of the largest and oldest radio-bright AGNs, also known as radio galaxies. Robert Lea, Space.com, 25 Feb. 2026 The surrounding plumes of incredibly hot gas exert their own pressure, in this case even higher than most other radio galaxies. Andrew Paul, Popular Science, 15 Jan. 2026 Located more than 656 million light-years away, it is now classified as a giant radio galaxy that has a blazar in its core. Julia Musto, Fox News, 1 Apr. 2023

Word History

First Known Use

1959, in the meaning defined above

Time Traveler
The first known use of radio galaxy was in 1959

Cite this Entry

“Radio galaxy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radio%20galaxy. Accessed 15 Mar. 2026.

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