Quote from : Star Wars: Episode III - Revenge of the Sith Movie

[Shock troopers are searching for the body of Yoda]
Clone Commander Thire: There is no sign of his body, sir.
Mas Amedda: Then he is not dead?
The Emperor: Double your search!
Clone Commander Thire: Yes, sir! Right away, sir!
[the troopers exit]
The Emperor: [to Mass Amedda] Tell Captain Kagi to prepare my shuttle for immediate takeoff.
Mas Amedda: Yes, Master.
The Emperor: I sense Lord Vader is in danger.