Yes.

Before I begin to talk on time travel, I would like to talk about time itself. Time is a property of the universe, in fact it is the fourth dimension of space-time. That is space has three dimensions while time is the fourth dimension. Albert Einstein has taught us in his relativity that there is nothing like absolute time. This means that different people observing a particular event might measure different time for the event.

In this post, I want to talk about what is called the arrow of time. Why do we feel that time flows in the forward and not in the backward. According to Stephen Hawking in his book A Brief History Of Time, there are about three arrows of time and they are- the thermodynamic arrow, the psychological arrow and the cosmological arrow of time. The important thing to note is that they all point to the same direction. Forward.

Entropy defines the degree of disorderliness of a body and according to the second law of thermodynamics, if things are left to themselves, entropy would increase. This means that the disorderliness of a body would increase. Let’s take an egg for an example. An egg has a more likelihood of cracking, that is its entropy tends to increase. And when it cracks, it is quite not possible for it to form back as a whole egg. At least, it doesn’t happen this way.  Time follows a similar pattern, it can only  move forward.

The psychological arrow deals with the fact that we remember things from the past and not from the future. If this arrow of time doesn’t follow the same direction as the thermodynamic arrow, we would remember things from the future and not from the past. This is not what happens and so the arrow points in the forward direction.
The cosmological arrow deals with the fact that the universe is expanding rather than contracting.
Time Travel

In 1935, Einstein and Nathan Rosen wrote a paper in which they showed that general relativity allowed what they called “bridges,” but which are now known as wormholes. The Einstein-Rosen bridges didn’t last long enough for a spaceship to get through: the ship would run into a singularity as the wormhole pinched off. However, it has been suggested that it might be possible for an advanced civilization to keep a wormhole open.

But a question we might ask is that why haven’t we seen anybody from the future if time travel is indeed possible.

Source: A Brief History Of Time