galactic halo
Britishnoun
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A large, spherical region of relatively dust-free space surrounding a spiral galaxy such as the Milky Way. The inner regions of the galactic halo contain globular clusters of very old stars, while the outer regions are apparently occupied by large amounts of dark matter.
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See also MACHO
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
His work has focused on uncovering the structure of the Milky Way and identifying faint stellar streams and substructures that make up the galactic halo surrounding our spiral galaxy, and helping reshape our understanding of how galaxies evolve, according to his website.
From Los Angeles Times
Now, astronomers have begun to identify the remains of its meals smeared across the galactic halo, a huge spherical volume taking in the Milky Way’s spiral and much space beyond.
From Science Magazine
According to the ESO, a galactic halo has both dark and regular matter that's largely made up of hot, ionized gas.
From Fox News
"Halo gas fuels star formation as it falls toward the center of the galaxy, while other processes, such as supernova explosions, can eject material out of the star-forming regions and into the galactic halo."
From Fox News
A new study about an FRB discovered in November 2018 reveals more about it, as well as the massive galactic halo it traveled through.
From Fox News
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
