Space/Science — HabitableZone

Space/Science » in reply to Water Older Than the Sun . . .

Astrochemistry

http://en.wikipedia.org/wiki/List_of_interstellar_and_circumstellar_molecules#Diatomic_.2843.29

Over two hundred chemical compounds (many of them organic) have been detected so far in interstellar and circumstellar space. No doubt this is only a partial list. In spite of the harsh temperature, radiation, and vacuum environment, the dust and gas clouds (AKA "molecular clouds") where stars form are an active site for the formation of complex molecules.

Of course, the stars themselves are too hot for anything but solitary atoms to exist (and they are ionized), but the outer reaches of stellar atmospheres and the mineral grains and dusty particulates in these clouds support an active chemistry. Tiny but numerous carbon and silica grains and even Bucky Balls provide, through their vast numbers, an immense surface area where atoms, free radicals and ions can accumulate and be catalyzed into complex compounds.

This is why there is so much interest in examining cometary material and ices which are pristine materials left over from the earliest history of the solar system. This is really primordial stuff.

By the time the early protoplanets cooled off they were already being bombarded by meteorites and comets saturated with complex molecules, many of them recognized precursors for biochemistry. If there is the slightest chance for life to get started, it will. All the preliminary ingredients are already there.

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