Does Uniform velocity (motion) of moving masses exist in the Universe?

Answer 1

no

Answer 2

A mass suspended in space will have uniform velocity, assuming that no forces are present within a reasonable distance from it.

But since the universe is filled with objects (planets, stars, comets, dust, etc), these objects exert a force on that suspended mass which will cause it to accelerate thus breaking the uniform velocity concept.

Although considering the distances of these "other" objects, which is usually VERY large, the force-at-a-distance (example is gravity) that they exert is so small it can be considered nonexistent, so I guess uniform velocity is possible.

Did I just contradict myself? Hehe

The point is, unless this suspended "moving mass" of yours stays considerable away from other large objects in space, it would have uniform velocity.