Cosmos

Time

Since space and time are unified, the motion through space impacts time: time slows down for the person who is moving but goes faster for the one who stands still; which implies that the passage of time as we experience it may be just an illusion. In that case, every moment in time from the beginning till far in the future coexists together; but in a different region of the cosmos. That leads to the concept of time travel: due to the fact that space and time are a unified physical entity it is

possible that there are some shortcuts in the fabric of space time that can lead us to another period of time different from our present time. Despite the possibility of time travel; there is no proof that we can change the past or even the future. The reason: the different periods of time coexist and have a fixed state. Still, the exact nature of time is not fully understood.