If Zapata's machine were to fly far out into outer space and eventually run out of fuel, several factors would come into play regarding his forward movement:
1. Inertia: In the absence of any external forces, the machine would continue to move forward at a constant velocity due to the principle of inertia. This is the tendency of an object to maintain its state of motion unless acted upon by an external force.
2. No Air Resistance: Unlike in Earth's atmosphere, where air resistance would eventually slow down the machine's forward movement, in the vacuum of outer space, there would be no air to create drag or resistance. This would allow the machine to maintain its forward momentum for an extended period.
3. Gravitational Forces: Depending on the distance and location in space, gravitational forces from celestial bodies (planets, stars, etc.) might influence the machine's trajectory. If the machine were close to a massive object, its path might be altered by the gravitational pull of that object.
4. No Propulsion: Since the machine has run out of fuel, there would be no means of propulsion to counteract the effects of gravity or alter its trajectory. Without fuel, the machine would continue on its forward path as determined by its initial velocity and any gravitational influences.
Overall, Zapata's machine would continue moving forward at a constant velocity until acted upon by external forces, such as gravitational pulls from celestial bodies. Eventually, without a means of propulsion, the machine would likely drift in space indefinitely or be influenced by the gravitational forces of nearby objects.