Did you watch the behavior of the aliens near the portal? Seemingly no effect (though one could argue they were barely affected on earth as it is). If anything the differences in pressures would have the opposite effect.Gravity from earth being translated through the portal maybe?
Last edited by will_perdikakis; 06-12-2012 at 04:08 PM.
It's the same thing as gunpowder. You can fire a gun underwater, or even in space, because the fuel and it's oxidizer are both contained within the gunpowder.
This is why SPIDER-MAN didnít make it into the final cut of Avengers..