21.   Flight controllers can be hundreds or thousands of miles away, linked to the drone by satellite.

22.   For this reason, the game controller is a surprisingly good physical interface for programs like the Music Generator.

23.   Ground controllers are hopeful a cold front bearing down on Kennedy will push through Florida at just the right point over the weekend to clear the skies for Sunday.

24.   If controllers were to add more power, some of that power would head down pathways that are already full, and they would overload.

25.   If a second gyroscope were to fail, the flight controllers would be unable to control the spacecraft reliably.

26.   In the Russian north, civilian traffic controllers are to be concentrated at four sites that previously were largely dedicated to military air defense.

27.   No doubt the Russian ground controllers are right, and everything will turn out fine in the end.

28.   Sometimes the controller is a single chip, like one in a factory that merely opens or closes a valve based on readings from a temperature sensor.

29.   Soon enough, the controllers will be busy operating two vehicles at once, and the Global Surveyor as well.

30.   The controller has been decertified and may be fired, said the FAA official, who spoke on the condition of anonymity.