Is time travel possible?

The idea of ​​time travel is tempting, attractive. Will suffice typing some buttons to go not just "somewhere else", but also "some other time". Since the publication of the novel "time machine" of HG Wells in 1895, after initially cinema and science is captivated by this idea.
But is it really possible a trip in time? Let us pause to answer that gives science. Last century, Albert Einstein showed that time is elastic, it can shrink and extend. For this he brought simple examples, travel from one continent to another. Only in one movement from London to New York, one shift at a billionth of a second in the future. This shift is very, very little to be noticed by us.
But the length of time can be amazing if you travel at the speed of light, about 300 thousand kilometers per second. Scientists say that if you travel by 99 percent the speed of light to the star Vega, which is 25 light years away and return back to Earth, only 7 years you spend time on the boat trip and the ground will not find in 2020, but in 2062 you will find. So travels 42 years into the future.
However, Einstein discovered that not only affects the speed of time, but also gravity. A real-time trip requires intense gravitational field and the scientists say unanimously: black holes in the universe of this offer. On their surface, "stop time" compared to our time. In fact, black holes are such because the light blocked by the strong gravitational fields of their own.
But approaching such a phenomenon mysterious universe, not only by technological impossible, but also dangerous. Black holes provide only travel in the future, to travel in the past have something else, what certain circles of science called "wormholes", or as are described in many science fiction films, such as "gate travel in time. "
But while there are black holes in security, the latter of these there is no evidence for their existence, and there are physicists who are skeptical about this.
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Photo fired from NASA telescopes. A black hole "swallows" a new star