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Shvoong Home>Science>Physics>Is Time Travel Possible? Summary

# Is Time Travel Possible?

Article Summary   by:scientificworld

Answering this question is easy. Of course, one can travel in time - we're doing it right now. Note that when reading this sentence, reading from the beginning of the paragraph is behind us - it's past. So it seems we are forever on this journey, from the past into the future.

The question to be asked then is: can v iajar in time without going through all the moments between one point and another? Or better yet, can we take shortcuts in time?

When Einstein started to play with time and space, in 1905, he discovered that they are not equal for everyone. Each has its own time and own space, configured by the local gravitational distortions and the speed of that frame. He discovered that the faster you travel the slower time passes you pa ra - or, if preferred r, the faster time goes for everyone else.

Yeah there the first time by him minutes. To accelerate towards the future, just go at breakneck speed. Suppose you travel toward a Pluto spacecraft that will fly at 80% speed of light. This dwarf planet is more or less than 5 horasluz the Earth (which means that light takes 5 hours to make the trip). At the speed prescribed for the mission control here on Earth, the trip was completed 6 hours and 15 minutes after departure. However, for you, aboard the ship, they would have spent only 3 hours and 45 minutes.

The phenomenon was repeated in the back, and came out and you would have aged only 7 hours and 30 minutes, while everyone would have lived here for 12 hours and 30 minutes. In practice, you would have advanced five hours into the future. Moral: to travel to the future, just run a lot.

What about travel to the past? Could someone run so much as to return even before the party? Hmmm, anoints the gues is disingenuous. In principle, no, because to travel into the past would have to exceed the speed of light. And one of the conclusions of relativity theory (the same one that provides all these distortions and allow the journey to the future) is that nothing can travel faster than light. Indeed, nothing can travel even at the same speed that light - but light itself, of course.

This is because, as you will accelerate, its mass increases, and it takes more energy pa ra continue accelerating. Upon reaching the speed of light, their mass would tend to infinity, and you prec Isaria infinite energy to overcome the barrier bar. Moreover, the light can only travel at that speed because the particles of which it is composed, the photons have no mass, then m does not need to worry about its mass approaches infinity.

That would be the end point, was not one of the other crazy possibilities created by the content would Relativ age. According to the equations under certain conditions (which may not be possible), you can create "tunnels" that would serve as a shortcut between different regions of space, types of portals that connect distant regions in the Universe.

Based on the assumption that one day we can build such a tunnel, the American physicist Kip Thorne, an expert in these tunnels (known as "wormholes"), imagined at least a chance to travel to the past. For that, one would first build one of these shortcuts by connecting one place on earth to a spaceship.

In this case, if the ship to travel to Pluto and the astronaut got out exhausted through the wormhole back to Earth, he could see that his ship, in fact, had not yet broken. But what occurred reria this case?

In theory, all this is possible. But even physicists do not really believe in these stories. The reason? When back in time, the astronaut who will find inside the spacecraft that the family was waiting ndo. This is one of the famous paradoxes storms that terrorized the scientists. So they prefer to believe that something in nature "prohibits" trips to the past - a "principle of chronology protection," as the British physicist Stephen Hawking.

What researchers do not know is that this mechanism would be - or even if it exists. At the moment, the game's journey into the past is completely open.

by superinteressante
Published: April 18, 2011
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