Consider the following situation. We have an evacuated straw, one meter in diameter, closed at both ends (but the ends can be easily opened). One end is here at ground level on Earth, and the other is at ground level on the moon. Assume that the straw is strong enough to resist breaking. We simultaneously open both ends of the straw. What happens? If you put into the straw a sealed cylinder of the same diameter, would the cylinder be sucked up onto the moon? Would air be sucked from Earth onto the Moon until there is a pressure equilibrium, or gravity balances out the pressure difference force? I appreciate any help in performing this thought experiment.