08 January 2007

Halo again from Andromeda

Andromeda has an extended halo of red stars, Puragra (Raja) Guhathakurta of the University of California, Santa Cruz, announced at an American Astronomical Society meeting in Seattle.

Galaxies have a central bulge, which falls away fairly rapidly, & a ring (disc) of stars around that, & finally a “stellar halo” with a much wider distribution.

Astronomers have been looking for “halo” stars like this for quite some time, & Andromeda seems to have come good for them, big time.

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