A person cannot save themselves in such a situation. To alter their course, they would need a rocket engine; even if the spacesuit were equipped with one, it would be far too weak. Consequently, the astronaut would most likely face a horrific death alone, suffocating inside the cramped spacesuit. Radio communication might remain functional in at least one direction, allowing the astronaut to tell anyone who could hear them how terrified they were before they died. Alternatively, they might spend their final hours alone with terrifying thoughts. Their only remaining choices would be to open the spacesuit and die from decompression — which, incidentally, would not be instantaneous — or to wait until the carbon dioxide they exhaled gradually poisoned their brain.

However, even this is insignificant compared with a situation in which an astronaut falls out of a spacecraft while wearing a spacesuit, somewhere en route to Mars or Jupiter. In such circumstances, it is virtually certain that no one will hear the astronaut or come to their rescue. A prolonged and agonizing death would be almost inevitable, and it would occur in darkness, without any landmarks.

Perhaps the most terrifying fate in the depths of space is to endure a long, slow death in the vast black void, where there are no sounds or points of reference beyond the light of the stars and the distant Sun. You would die in solitude, alone with your fears, knowing that your body would most likely never be found. It might orbit the Sun for millions of years before eventually colliding with a planet.