SETI bioastro: Galactic Habitable Zones?

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10 April 2000: Barren galaxies, Nature

"[Guillermo] Gonzalez and colleagues have now proposed that entire
galaxies, which contain millions of stars, also have habitable zones,
beyond whose boundaries life - or, at least, advanced life - can't get
a foothold. They say that the habitable zone of a spiral galaxy (like
the Milky Way) may encircle its centre, just as the habitable zone of
the solar system encircles the Sun. Inside or outside this band, a
galaxy is sterile."

http://helix.nature.com/nsu/000413/000413-4.html

See also this online May, 1999 article from Scientific American:

http://www.sciam.com/1999/0599issue/0599scicit1.html

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