I was probably wrong too...wouldn't the word be homogenous? meaning all the same substance whereas homogeneous would mean all arising from the same substance. In this case all of the elements in the atmosphere did not come down as one big mush, but as a lot of little this here and that over theres. When I studied organic chemistry we learned early that different subtances freeze at different temperatures and this was one way of seperating and purifying them. Methane is necessary for carbohydrates and protiens, while ammonia would be necessarty for amino acids. I thought food. Starships need to make their own food, and then someone shewed me the money. Territorial wars...now there's a possibility let me give it some thought.