But if you shoot into outer space, because there is no gas in outer space. So in theory, this kind of bullet can always do uniform linear fitness exercise. This is also in line with Newton's first law of motion. However, there are all kinds of stars and meteorites in space. If the bullet meets such a leader, it will either be captured as its satellite, or it will be inconvenient and have obvious influence. The final conclusion is that the bullet disappeared.
According to Newton's law, as long as there is no other external force, any object with acceleration will move in a straight line with unlimited uniform speed. Under the action of external force, it will change direction, accelerate or stop or drive in the opposite direction. In a word, the external force only changes its instantaneous speed, and the parallel lines are unchanged without external force. See if you can shoot in space. What happened? Assuming that the guns on all normal satellites are dry, what is its position? If you shoot in the opposite direction after flying to the satellite, the bullet is very likely to fall to the earth (provided that you look at the flight rules of the satellite). If you shoot in front of the satellite, the bullet will fly around the earth one rule higher than the satellite. If you shoot at or above the earth, the bullet may not fall to the earth or go deeper into space.
To put it bluntly, the space here should be an indoor space assuming that there are no other big stars in the universe. If a bullet flies at a certain speed, the probability that it can actually meet a big star and be captured by the Force is actually very low. The idle time between stars in the universe is much longer than expected, so most bullets will fly at a constant speed. But because there are some tiny floating dust in space, it will cause friction resistance to the bullet, so the bullet will eventually slow down.