ELI5: Explain Like I'm 5

Flight dynamics (spacecraft)

Flight dynamics is the science of how a spacecraft or aircraft moves in the air. A spacecraft has its own control systems that help the spacecraft go in the direction that it needs to go. The control systems work by changing the speed of the spacecraft, which makes the spacecraft turn or go in different directions. A spacecraft can also use its engines to push it forward so it can move faster. All of these things combined help the spacecraft to fly.