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

See Examples For:

extragalactic

The team also tested whether the proposed blazar population would produce too many gamma rays compared with the known extragalactic gamma ray background measured by Fermi.

From Science Daily ● May 24, 2026

Unlike the Hubble and James Webb Space Telescopes, which focus deeply on one part of the sky at a time, scientists will use Euclid to cover wide swaths of the extragalactic sky at once.

From New York Times ● Jul. 1, 2023

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.

From Science Magazine ● Jun. 21, 2023

An extragalactic outburst whose light hurtled through the inner solar system last fall was 70 times brighter than any other such eruption that scientists have observed, researchers report.

From Scientific American ● Mar. 29, 2023

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