1. Can we imagine time as the fourth dimension? If so why is this dimension different from other 3 spacial dimension in the way that we cant move forward and backward as we want, we are ever bound to have a velocity through this dimension and can't stop with respect to someone else's motion through time. 2. Is the concept of time necessary for physics? Do time have an independent existence? Can we refer to time without motion? If no Matter exist in the universe or no Matter moves relative to any other Matter, wont Time be meaning less? That's all for now. I'll try to add questions later. If anybody finds more valid questions that would boost this discussion, they can post it. Invitation are send to all curious minds !