SETI public: Astronomers plot galactic habitable zone

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From: LARRY KLAES (ljk4_at_msn.com)
Date: Fri Jan 02 2004 - 17:15:22 PST

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Astronomers plot galactic habitable zone
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Posted: Fri, Jan 2 5:06 PM ET (2206 GMT)

Astronomers have determined that up to one-tenth of the
stars in the Milky Way galaxy lie in a habitable zone that
would permit that to have planets that could harbor life.
The research, by Australian astronomers and published in
Friday's issue of the journal Science, determined that a
ring-shaped habitable zone opened in the galaxy 25,000
light-years from its core eight billion years ago. The ring
has since expanded and now includes stars as young as four
billion years old. The zone's size and location is based on
a number of factors, including the presence of heavy
elements needed to form planets and stars located a safe
distance from supernovae.

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