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Old 09-September-2004, 12:34 PM
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Well, with a mass 5 times that of Jupiter, and a gravity of 10 gee, this planet almost certainly has a hydrogen rich atmosphere. By combination with oxygen there may well be a lot of water in the atmosphere, and possibly a deep ocean layer overlaying the core; but there will almost certainly be no free oxygen...

oxygen combines too readily with hydrogen to remain in any great quantities.

This does not rule life out; but it does rule aerobic life out.

You may well get anaerobic life in the atmosphere of this gas giant; also other, closer gas giants like Gamma Cephei b are more or less in the habitable zone.

In fact, if we are considering such anaerobic lifeforms, which inhabit environments so different to our own, there is no real reason to limit our search to the habitable zone which would hold terrestrial planets like our own Earth;

At the end of the day, gas giant life will probably be limited in size and complexity
by the gaseous environment it in habits; too heavy, and it will sink in the light hydrogen rich atmosphere.
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