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Chances for earth-like planets and life around metal-poor stars

By SpaceRef Editor
January 6, 2003
Filed under , ,

Astrophysics, abstract
astro-ph/0301080


From: Hans Zinnecker  <[email protected]>
Date: Mon, 6 Jan 2003 14:53:33 GMT (10kb)

Chances for earth-like planets and life around metal-poor stars


Authors:
Hans Zinnecker

Comments: 5 pages, IAU Symp. 213, ed. R. Norris, C. Oliver, F. Stootman, in
press


We discuss the difficulties of forming earth-like planets in metal-poor
environments, such as those prevailing in the Galactic halo (Pop II), the
Magellanic Clouds, and the early universe. We suggest that, with less heavy
elements available, terrestrial planets will be smaller size and lower mass
than in our solar system (solar metallicity). Such planets may not be able to
sustain life as we know it. Therefore, the chances of very old lifeforms in the
universe are slim, and a threshold metallicty (1/2 solar?) may exist for life
to originate on large enough earth-like planets.

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