extragalactic

American  

[ek-struh-guh-lak-tik] / ˌɛk strə gəˈlæk tɪk /

adjective

1. outside the Milky Way system.

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extragalactic British  

/ ˌɛkstrəɡəˈlæktɪk /

adjective

1. occurring or existing beyond the Galaxy

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Etymology

Origin of extragalactic

First recorded in 1850–55; extra- + galactic

Example Sentences

Kewley says the work highlights how chemical signatures in a galaxy's gas can be used to uncover its past, establishing extragalactic archaeology as a powerful new approach.

From Science Daily • Mar. 23, 2026

However, in recent research published in Science, an extragalactic source for these subatomic particles has been identified.

From Scientific American • Dec. 20, 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.

From New York Times • May 4, 2022

The rate at which IceCube detects extragalactic neutrinos is “a strong hint that these are the sources,” says theorist Eli Waxman of the Weizmann Institute of Science.

From Science Magazine • Mar. 31, 2021

At such a rate, we will reach it in ten billion years, and extragalactic astronomy will then be a great deal easier.

From "Cosmos" by Carl Sagan