Usually means: Spherical, outer region of galaxy.
Definitions Related words Mentions
We found 9 dictionaries that define the word galactic halo:

General (5 matching dictionaries)
  1. galactic halo: Collins English Dictionary
  2. galactic halo: Wiktionary
  3. galactic halo: Dictionary.com
  4. Galactic Halo, Galactic halo: Wikipedia, the Free Encyclopedia
  5. galactic halo: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. galactic halo: Encyclopedia

Science (2 matching dictionaries)
  1. Imagine the Universe! Dictionary (No longer online)
  2. Galactic Halo: Extragalactic Astronomy

Tech (1 matching dictionary)
  1. High-Energy Astrophysics (No longer online)

Definitions from Wiktionary (galactic halo)

noun:  (astronomy) An aggregation of individual stars, dust, and gas (and possibly dark matter) that surrounds a galaxy.

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