It should be noted that in vacuum space, by using the impulse of particles that have a speed close to the speed of light, it is possible to produce energy by which a spaceship could reach the speed close to the speed of light.
According to the calculations, after 29 billion years from the beginning of the Big Bang, the universe reaches a point of stagnation or a point where its linear velocity becomes zero and the rotational motion reaches its maximum and from that point universe start its back motion toward the center of universe.