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				 Re: Colonizing 
 I'm not claimining to have a degree in planetology but AFAIK:
 Oxygen is a byproduct of organic life...
 Carbon oxides are too dense a gas to create a gas giants atmosphere...  any would be compressed into a solid "frozen" core.
 
 Gas Giants can be huge and very massive...  but they have EXTREMELY low densities (that's what makes them a GAS giant)... so if the gases would contain "resources" then siphoning is possible...  but GAS dosen't, any resouces would be formed in a compressed "core", which can be quite large... but is comprized of mostly frozen gases...
 
 again, this is to the best of my knowledge, but I am somewhat informed.
 
 Trachmyr
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