Time Travel


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            Taxi  can take you to the place you want, however, what if you say to the driver, take me to the past time. Time machine and time travel are popular in the scientific fictions and movies. However, can we really take the time travel in the future times? Different scientists hold different opinions. We can travel through height, width and length easily,but how about time?

timemachine.jpg

            According to Albert Einstein's special relativity, if one were able to move information or matter from one point to another faster than light, then there would be some inertial frame of reference in which the signal or object was moving backward in time. One of the most famous movie to transport people into the past is the A Sound of Thunder, based on the classic 1952 Ray Bradbury novella. In it, a group of hunters build a time machine, which looks like a wormhole of sorts, to travel back to the dinosaur era. There, things go awry when one hunter kills a butterfly, which completely changes the course of history. And what I want to point out is the  wormhole, which considered as a important stuff in time travel. "This is a little bit like a tunnel or shortcut between two distant points", said Paul Davies, author of "How to Build a Time Machine." He also takes and example, "So for example, if I had a wormhole here in my hotel room and I jumped through it I wouldn't come out on Pennsylvania Avenue, I'd maybe come out near the other side of the galaxy." And some of the Scientists have theorized that such a shortcut through time and space could be turned into a time machine.whsim.gif

            As the Wikipedia said about wormhole, a proposed time-travel machine using a traversable wormhole would (hypothetically) work in the following way: One end of the wormhole is accelerated to some significant fraction of the speed of light, perhaps with some advanced propulsion system, and then brought back to the point of origin. Alternatively, another way is to take one entrance of the wormhole and move it to within the gravitational field of an object that has higher gravity than the other entrance, and then return it to a position near the other entrance

             When reading an journal on the National Geography News, I also found that Einstein's relativity theory not only set the speed of light as the universal speed limit, also showed that distance and time are not absolute but instead are affected by one's motion. If an astronaut travels into space for six months at a substantial fraction of light speed and takes another six months to return to Earth, he would land in the future. While a year will have elapsed on the astronaut's clock, tens of thousands of years may have gone by on Earth, depending on how close to light speed the astronaut traveled.

            To conclude the viewpoint of the supporters, we may use the statement of Brian Greene, a Columbia University physics professor, "The bottom line is that time travel is allowed by the laws of physics."

            We talked a lot about the time travel is possible, while the opposer of time travel may still be the majority. "Wormholes are the future, wormholes are the past," said Michio Kaku, author of "Hyperspace" and "Parallel Worlds" and a physicist at the City University of New York. "But we have to be very careful. The gasoline necessary to energize a time machine is far beyond anything that we can assemble with today's technology." To punch a hole into the fabric of space-time, Kaku explained, would require the energy of a star or negative energy, an exotic entity with an energy of less than nothing. So, it is impossible at least now for us to use wormhole as a machine to travel. It is also, much more difficult for us to travel to the past time than to the future. Maybe if there were a theory of everything, one could solve all of Einstein's equations through a wormhole, and see whether time travel is really possible, Kaku said. "But that would require a technology far more advanced than anything we can muster," he said.

            After a lot of research I can only draw to the conclusion that, "Don't expect any young inventor to announce tomorrow in a press release that he or she has invented a time machine in their basement." Cherish our time now, it is impossible for us to experience time travel in our limited life time, nothing can come back again once you lost it.

 SOURCE FROM:

http://news.nationalgeographic.com/news/2005/09/0916_050916_timetravel.html

http://www.livescience.com/1339-travel-time-scientists.html

http://en.wikipedia.org/wiki/Wormhole

http://en.wikipedia.org/wiki/Time_travel

http://www.foxnews.com/scitech/2011/07/25/time-travel-is-impossible-scientists-say/

           

            

2 Comments

If time travel eventually happened one day, i bleive that it would be sciences greatest technological feat ever. This is a topic that fascinates many people for a variety of reasons. One thing that i want to point out is that i don't think time travel would be anything like what we see in the movies with all of these crazy machines. REcently in men and black 3, will smith jumps from the top of the building and uses a device to take him back into time. Although i might be completely wrong, i can't see that happening. I can envision something happening though with wormholes and in space. There is so much in our universe that we have not even had the chance to explore yet. FOr all we know there could be something out there that unlocks time travel. We could even find another society in this galaxy that has mastered time travel for all we know. There are numerous possibilities with this though that make the topic so fascinating. Another thing that i would like to point out is this topic is extremely hard for scientists to grasp and conquer. So far scientists do not have many leads. In addition the leads that they do have such as wormhole involvement are either extremely difficult or nearly impossible to perform experiments on. And as we all know experimentation is one of the crucial parts of science. MAybe in the future we will this develop but until then we can only think about the possibilities.

As an avid "Doctor Who" fan, I can only hope that there is some little British alien running around in a blue Tardis, looking out for all of us little humans here on Earth. The reason that this relates to your blog is because the Tardis harnesses the power to time travel. As you said about the theory of relativity, The Doctor described time as not in a logical manner but as a mass of "wobbly wobbly, timey wimey". The idea of wormholes is the most valid form of potential time travel in the future.

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