We know that a particle is always in motion and never at rest. Rest is a relative concept. When two particles are moving at same velocity, the relative velocity between them is zero and it can be said that the particles are at rest relative to each other. If the motion of a particle is also compared with itself, the particle can be consider at rest with relative to itself. We know that our universe is expanding. But if we compare the expansion of our universe, with relative to our universe itself; can we say that, our universe is at rest?