[Phoenix-D]

There could be an oxygen nebula. Of course, the pressure there would still be far too low to support human life, to say nothing of the tempature.

Oxygen occurs naturally wherever it collects due to gravity, or where it is created by fusion reactions (or supernova)

EDIT: air exerts the pressure because its a bunch of N2 and O2 molecules bouncing around. Those hitting the container are what creates the effect we call pressure.

[ January 28, 2004, 03:49: Message edited by: Phoenix-D ]