All kinds of movement occur when a thing throws something out or pushes something back and then the thing moves.
Like the car pushes the road back, the rockets throw gases at high speed to move. Everything works on conservation of linear momentum.
Is there any way that a closed system can move without throwing or pushing anything outside of it? Inside of it anything can happen, like wobbling, or internal zig zag movement which can move it.
Note: Throwing or shining light doesn't count.
Is such a system possible, or is it known to modern science?
Edit: I'm clarifying the question to avoid a trivial solution of uniform motion. Which this answer addresses.
Of course, an unaccelerated object moving at a constant velocity will move from point A to B. But that is not what I'm trying to ask.
Let's say an object is at point A, at rest. The goal is to move it to point B, which is at a non zero distance 'd' from point A. So the object must move from point A to point B and then rest in point B. Can this be done by the object itself without it throwing or pushing something outside the object? Is such a thing possible?
The momentum is conserved totally, as the object is at rest in B, as it was in A. But it's initial position is different from it's final position. So this should be theoretically possible as the total momentum is conserved. But how do you get it from point A to B? A small jerk like motion is possible but that length of travel is restricted by the length of the object itself. So please consider that if the width and length of the object is x, let's say the distance that needs to be travelled 'd' should be around 100x. So the initial gain made by some sort a jerky motion should be repeatable to reach 100x distance.
Also please note don't go into unproven conjectures of special relativity or quantum mechanics. Please restrict the answer to classical physics. I'm trying to imagine a macro world classical physics example, like a mechanism of wobbling or a combination of levers pushing and pulling which can kinds of move by a system by itself.