extragalactic

adjective
ex·​tra·​ga·​lac·​tic | \ ˌek-strə-gə-ˈlak-tik How to pronounce extragalactic (audio) \

Definition of extragalactic

: 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 Since the discovery of fast radio bursts in 2007, scientists have dedicated efforts to identify the sources of extragalactic phenomena — ones that might exist outside the Milky Way galaxy. Kristen Rogers, CNN, "Fast radio burst may have come from the Milky Way," 4 Nov. 2020 Beyond the boundary of our own galaxy, the accelerated cosmic expansion offers an ideal backdrop for permanent social distancing among extragalactic civilizations. Avi Loeb, Scientific American, "Social Distancing on a Cosmic Scale," 23 Sep. 2020 One group looked at black holes as a possible explanation, since black holes are the brightest extragalactic radio sources in the sky. Quanta Magazine, "Whisper From the First Stars Sets Off Loud Dark Matter Debate," 29 Mar. 2018 One group looked at black holes as a possible explanation, since black holes are the brightest extragalactic radio sources in the sky. Quanta Magazine, "Whisper From the First Stars Sets Off Loud Dark Matter Debate," 29 Mar. 2018 One group looked at black holes as a possible explanation, since black holes are the brightest extragalactic radio sources in the sky. Quanta Magazine, "Whisper From the First Stars Sets Off Loud Dark Matter Debate," 29 Mar. 2018 One group looked at black holes as a possible explanation, since black holes are the brightest extragalactic radio sources in the sky. Quanta Magazine, "Whisper From the First Stars Sets Off Loud Dark Matter Debate," 29 Mar. 2018 One group looked at black holes as a possible explanation, since black holes are the brightest extragalactic radio sources in the sky. Quanta Magazine, "Whisper From the First Stars Sets Off Loud Dark Matter Debate," 29 Mar. 2018 The particle was a neutrino, electrically neutral and almost massless, which means its path could be traced back to the extragalactic event that created it. Daniel Clery, Science | AAAS, "Ghostly particle caught in polar ice ushers in new way to look at the universe," 12 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'extragalactic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of extragalactic

1851, in the meaning defined above

History and Etymology for extragalactic

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The first known use of extragalactic was in 1851

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Cite this Entry

“Extragalactic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extragalactic. Accessed 5 Mar. 2021.

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