How come the space station needs to fire a rocket regularly to stay in orbit, but dangerous space junk can stay up there indefinitely?

The space station needs to fire a rock et regularly to maintain its orbit because it is constantly moving through space . needs to counter act the grav itational pull of the Earth . On the other hand , space junk , such as old satell ites or debris , does not have any prop ulsion and simply flo ats along with the current s of space . This is why it can stay in orbit in def initely , but it can also pose a haz ard to other objects in space . </s>