The Atmospheric Atmosphere

The assumption here is that this atmosphere is ten thousand times more massive than the earths. There wasn't any mention, thoughof of geo thermal. No radioactive decay. Ah, if you've got 50 billion years, what kind life? What could biology be after evolving for many, many more times than the age of the universe? It's incredible. Iwould love to see a science fiction show let that deal, that, deal with this kind les.