英语时差：用一根绳子连接地球和同步卫星（上）

A geostationary satellite orbits the equator in the same direction and speed the earth turns. That means the satellite stays stationary with respect to the ground. It seems to be hanging in mid-air — if, by mid-air, you mean 22,500 miles high.

Imagine yourself sitting inside a geostationary satellite. You want to bring up some supplies from earth.

Why not let down a long rope? After all, your satellite will always be over the same spot of ground. Someone could stand under you, wait for the rope to come down, and tie off a cooler full of soda.

Sounds funny, but would it work? Is this just an odd way to do things or is it impossible?

In fact, it is impossible, and here’s why…