ex·​tra·​ga·​lac·​tic ˌek-strə-gə-ˈlak-tik How to pronounce extragalactic (audio)
: 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 Last year, IceCube physicists reported 79 neutrinos coming from the heart of a nearby galaxy called NGC 1068, the first steady source of extragalactic neutrinos pinpointed. Byadrian Cho, science.org, 22 June 2023 For a long time, Lorimer was the only one who'd found a seemingly extragalactic burst, and doubts crept in. Sarah Scoles, Discover Magazine, 7 Jan. 2014 In a recent study published in Science, however, researchers identified an extragalactic source for these subatomic particles. Phil Plait, Scientific American, 20 Dec. 2022 On its way to Earth, this CME plowed past a satellite called ACE , designed to study subatomic particles ejected by the Sun (as well as from galactic and extragalactic sources, too). Phil Plait, Discover Magazine, 19 Apr. 2011 The last generation of extragalactic astronomy has moved into far more sophisticated analyses than cataloging. David J Eicher, Discover Magazine, 19 May 2020 However, this alternative still requires an extragalactic push. Jake Parks, Discover Magazine, 3 Oct. 2018 But what makes this extragalactic structure so interesting? Joshua Hawkins, BGR, 7 Nov. 2022 What began during lockdown as a live multimedia cartoon, about a feline mission to stop extragalactic rats from devouring the moon, is now a hilarious graphic novel. New York Times, 4 May 2022 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'extragalactic.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


International Scientific Vocabulary

First Known Use

1851, in the meaning defined above

Time Traveler
The first known use of extragalactic was in 1851

Dictionary Entries Near extragalactic

Cite this Entry

“Extragalactic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extragalactic. Accessed 1 Dec. 2023.

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