If the air had no currents, the steady state would be motionlessness except gravity effects. If it had currents, the steady state would be to follow them. Of c

If the air had no currents, the steady state would be motionlessness except gravity effects. If it had currents, the steady state would be to follow them. Of course those gravity effects would also apply to the air, which makes the scenario inconsistent. I'd be interested to see a formulation of the laws of physics that actually makes a substantial interplanetary atmosphere possible.