Editing Jet propulsion (section)

{{Short description|Thrust produced by ejecting a jet of fluid}}
[[File:Rolls-Royce Trent 1000 jet engine.jpg|thumb|The jet engine of a [[Boeing 787 Dreamliner]].]]
[[File:Pump-jet on NatchanWorld 02.JPG|thumb|A [[pump-jet]] on a ferry.]]
'''Jet propulsion''' is the [[propulsion]] of an object in one direction, produced by ejecting a [[jet (fluid)|jet]] of [[fluid]] in the opposite direction. By [[Newton's third law]], the moving body is propelled in the opposite direction to the jet. [[Reaction engine]]s operating on the principle of jet propulsion include the [[jet engine]] used for [[aircraft propulsion]], the [[pump-jet]] used for [[marine propulsion]], and the [[rocket engine]] and [[plasma thruster]] used for [[spacecraft propulsion]]. Underwater jet propulsion is also used by several marine animals, including [[Cephalopod|cephalopods]] and [[salp]]s, with the [[flying squid]] even displaying the only known instance of jet-powered aerial flight in the animal kingdom.