If you want to turn and face a new direction in space there aren’t a lot of options available to you. Flying around like an airplane in space doesn’t work at all (other than slowing down, this is a fair approximation). However, if you just want to turn in space without moving (thrusters always push you around), you can “push on yourself”. If it used tiny thrusters it would run out of fuel pretty quick (that thing is always looking at stuff) and it would pollute its tiny corner of space with exhaust. So, if you want to move in space, you’ve got to move something else, and if you want to turn, turn something else.