Ostriker-Peebles halo

Ostriker-Peebles halo

[¦äs·trīk·ər ′pēb·əlz ‚hā‚lō]
(astronomy)
A spherical distribution of matter of unknown nature that is postulated to exist to account for the stability of the highly flattened visible disk of the Milky Way Galaxy.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.