<center><img src="https://img1.steemit.com/400x250/https://cdn.pixabay.com/photo/2017/02/03/12/06/time-2034990_960_720.jpg" /><br/><em><a href="https://pixabay.com/pt/tempo-de-portal-m%C3%A1quina-do-tempo-2034990/">Time clock image</a></em></center>
Time travel is different from what we see in movies, not just clicking a button and going back in time, if there is time travel, then there is a possibility of having time travelers out there walking in this very moment, modifying the future without anyone knowing, the idea of hack the time is fantastic, myself I would go back to February 4, 2009,  and buy some bitcoin haha, and today it would be rich, but according to the theory of the butterfly effect, where it says ```"if a butterfly when flapping its wings in Brazil would cause a hurricane in Japan"```, what would happen a disaster In the present, therefore, these bitcoin that I would buy in the past, someone not going to buy it, and that person could become a dictator and bitcoin never value itself as it does today.
<center><h3>Risks</h3></center>
 Traveling in time beyond being impossible today, there are many dangers like, for example: you would risk destroying our dimension, entering an infinite loop, dying, getting lost in time, making it worse. The only benefit in time travel would be the trip to the future, where you would learn technology that does not exist today, future is allowed, past not.
There are several theories that allow time travel, such as:
- String theory: where the universe exists several dimensions as if it were line, each line the world is a different version.
<center><img src="https://img1.steemit.com/300x150/https://cdn.pixabay.com/photo/2017/06/14/23/15/soap-bubble-2403673_960_720.jpg" /><br/><em><a href="https://pixabay.com/pt/bolha-de-sab%C3%A3o-enorme-grande-2403673/">Each bubble one dimension</a></em></center>
- Theory of relativity: where it allows to travel in time to the future reaching the speed of light.
<center><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Spacetime_curvature.png/300px-Spacetime_curvature.png" /><br/><em><a href="https://en.wikipedia.org/wiki/Theory_of_relativity#/media/File:Spacetime_curvature.png">Theory of relativity</a></em></center>
- Tachyon is a particle that exceeds the speed of light, this is the only way to travel to the past.

<center><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Tachyon04s.gif/250px-Tachyon04s.gif" /><br/><em><a href="https://pt.wikipedia.org/wiki/T%C3%A1quion#/media/File:Tachyon04s.gif">Tachyon Image</a></em></center>

As we have seen, it is impossible to survive a time travel with the current technology, but we must not disregard, therefore, we still do not know the whole earth, imagine then the universe, the technology is advancing rapidly, in a few years I believe it will be possible to discover Whether the trip in time is a valid possibility or not. 
<center><h3>And what do you think about time travel? Is it possible or not?</h3>
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