"If time travel is possible, where are the future tourists?"
-Steven hawking-

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In his book "yanus equation" (a really good book I recommend it), J Sprooil checks one of the problems that interrupt time travel.
It tells about a genius mathematician, who's goal is to find the secret of time travel, he meets a pretty and strange woman. They fall in love with each other even though he doesn't know anything about her past.
He starts wondering about her real identity, and at the end he finds out that she had transgendered. He also find out that "she" actually travels in time from the future, and that "she" is actually him himself, but from the future. Which means, he fell in love with himself.
Most of the readers wondered what would happen if they made a child. And if the child would go back in time just to grow up and become the mathematician from the beginning of the story, so can you be your mother, father, son and daughter of yourself?

Changing the past
The time is one of the most biggest questions of the universe. We all are drifting in the river of time against our will.
Around 400 AD, holy Augustinus wrote a lot about the paradoxally nature of the time:
"How can past and future can be existing if the past doesn't exists anymore and the future doesn't exists yet? And about the present, if the present was always present and never kept moving and becoming the past, so he isn't time, but internity."
If we will take Augustinus's idea one step forward, we can see that time isn't possible, because the past already passed, the future doesn't exists and the present is existing only for a moment.
Like Augustinus, we all wondered some time about the time's weird nature and how does it different from space.
If we can move forwards and backwards in space, why can't we do it on time?

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fact:
The first book that ever wrote about traveling through time was written at 1733 and since then the science fiction used this idea as normal thing.
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From the scientific point of view, time travel isn't possible in Newton's universe, which in these times was caught as an arrow. From the second he starts ("shots"), you can never change his path, one second on earth is one second in all the universe.
This catching of time busted by Albert Einstein, who showed that time is more like a river which zigzagging (sorry for the wrong word) all over the universe, in some parts he slows down and in others he becomes faster, one second on earth isn't something that stands and doesn't changing.
As Albert said in his Special relativity, the time is slower as faster you move.
Which means you can travel forwards in time.
(This happens because of a thing called spacetime which I will explain in some other chapter.)
But to travel backwards, you need to get faster then light, which is impossible because you'll have to get to infinite mass.
So traveling time forwards is possible and it already done more then once.
When you travel in space you actually travels forwards in time, if we could get closer to the speed of light and fly to the closest starts, it'll feel to the pilot like a minute, while on earth there will pass 4 years.

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Fact:
The astronauts in our years are traveling a little forward in time every time they flies to space. Because that they are traveling 18641 mp/h over earth, their hand watches and clocks are ticking a little slower then the clocks on earth.
Which means that after a year in space they are traveling a millisecond to the future when they gets back to earth.
The world record of time traveling is held by the Russian cosmonaut Sergei Abdeyev, who was 748 days in a path over earth and jumped 0.02 seconds to the future when he got back to earth.
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So this is the end of the first part about time travel, next time I'll talk more about traveling backwards in time
Hope you enjoyed and learned something new

Tell me what you think about the book In the comments and you can also ask me to talk about something you want.
Thanks and until next time...
Stay smart!