Habitable_Zones - Extra Extra-Solar Life Life Habitable...

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xtra- olar Life: Extra Solar Life: Habitable Zones Stephen Eikenberry 02 November 2010 AST 2037 1
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Life in the Solar System? Mercury/Venus too hot Earth – just right ars as OK once (?) but now cold Mars – was OK once (?), but now cold Jupiter, Saturn, Uranus, Neptune too cold (though some moons may be OK) 2
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Life Ingredients The ingredients of (Earth-like) life are all common: H 2 O C etc. So are many possible alternatives to them (i.e. Si, NH 3 , etc.) Why are these so common? they are so common why isn’t there life on ALL the If they are so common, why isn’t there life on ALL the planets? 3
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Optimal Temperature Range It’s not unique, but H 2 O is our favorite solvent It’s not unique, but we prefer it as a liquid This means: T > 0 C <100 T <100 C We need to find temperatures in this range (at least part of the time) How common is that? 4
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What Sets Planet Temperatures? Lots of factors (such as?) 5
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Temperature Balance Assume that the dominant factor is stellar radiation Flux(emitted) = Flux(radiated) how balance; solve for T Show balance; solve for T Show range in distance 6
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Habitable Zone The zone in a stellar system where water is in liquid form (at least some of the time) 7
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Habitable Zones: Other Stars?
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Habitable_Zones - Extra Extra-Solar Life Life Habitable...

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