December 22, 2007
ScienceDaily (Dec. 22, 2007) — After studying more than 20,000 stars, researchers
conclude that our disk-shaped galaxy wears two spherical halos of stars left behind
when their original galaxy was either assimilated or dissolved into our own.
Ronald Wilhelm, an assistant professor of physics and co-author of the report, Two Stellar Components in the Halo of the Milky Way, said that though our galaxy is shaped like a flat disk of up to 400 billion stars rotating clockwise, it also wears two crowns of stars that make up a spherical haze and envelops the galaxy’s disk. Though others have suggested that the galaxy wears two halos of stars before, this is the first definitive proof of two different halos, he said