8 points
I would imagine that the relative motion between the entry/exit portal would be more important than the absolute motion of the two portals.
11 points
*
Portal 2 ends with you (Chell) placing a entry portal on Earth vs an exit portal on the Moon.
That means the portals were ~2236 mph (aka Mach3) relative to each other.
1 point
1 point
Wouldn’t that provoke all air in the Earth to get sucked to the Moon due to the difference in atmospheric pressure?
4 points
3 points