SETI bioastro: Galactic Habitable Zones?

From: Larry Klaes (
Date: Fri Apr 14 2000 - 13:38:57 PDT

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."

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

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