extragalactic
adjective
ex·tra·ga·lac·tic
ˌek-strə-gə-ˈlak-tik 
: originating or existing outside the Milky Way galaxy
also
: of or relating to extragalactic space
extragalactic astronomy
Examples of extragalactic in a Sentence
Recent Examples on the Web
That means its origin must be extragalactic, perhaps created in the violence of a star exploding and producing a gamma-ray burst, or a supermassive black hole ripping a star or gas cloud to shreds with its titanic gravitational tidal forces.
—
Keith Cooper, Space.com, 16 May 2025
That’s no supernova The most common extragalactic transient luminous events, meaning flashes of light that evolve and vanish rapidly, are supernovae.
—Elizabeth Rayne, Ars Technica, 27 Nov. 2023
This extragalactic neighbor of our home Milky Way galaxy is located almost 200,000 light-years away from Earth and could crash into our home galaxy in about two billion years.
—Laura Baisas, Popular Science, 29 Nov. 2023
True, astronomers still don’t know the origins of these extragalactic milliseconds-long radio pulses, and until this year fewer than 20 had ever been detected.
—Yvette Cendes, Discover Magazine, 15 Dec. 2016
See All Example Sentences for extragalactic
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Keith Cooper, Space.com, 16 May 2025
That’s no supernova The most common extragalactic transient luminous events, meaning flashes of light that evolve and vanish rapidly, are supernovae.
—Elizabeth Rayne, Ars Technica, 27 Nov. 2023
This extragalactic neighbor of our home Milky Way galaxy is located almost 200,000 light-years away from Earth and could crash into our home galaxy in about two billion years.
—Laura Baisas, Popular Science, 29 Nov. 2023
True, astronomers still don’t know the origins of these extragalactic milliseconds-long radio pulses, and until this year fewer than 20 had ever been detected.
—Yvette Cendes, Discover Magazine, 15 Dec. 2016
See All Example Sentences for extragalactic
Cite this Entry
“Extragalactic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extragalactic. Accessed 5 Jun. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share