galactic halo

noun

1. astronomy a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy

galactic halo

1. 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.
2. See also MACHO

Example Sentences

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

Such bodies are intrinsically faint and would therefore be difficult to see in the Galactic halo from Earth.

From Nature