# Would Scientists Really Be Able To Build A Time Machine?

Updated on October 22, 2011

For several decades, sci-fi movies and books on time travel have tickled our imagination into believing that maybe one day, some scientist or theorist will invent the magic of a time machine that will enable us to turn the clock upside down. We have asked ourselves zillion times, can it be done?

In theory, time travel is possible, say prominent physicists and researchers. While travelling to the future is a theoretical possibility for now, latest research indicates that it is turning the clock back that is no longer a probability. Time is considered as the fourth dimension by physicists and it is compared to dimensions like length, height and weight. For example, when we go to our favourite coffee shop, we are travelling in all the spatial dimensions like length height and weight while traveling in time as well. Einstein's greatest ‘brainchild' is the theory of relativity, which gave new meaning to our understanding of space and time.

## Time Travel And The Laws Of Physics

Simply put, time is relative and the laws of physics are the same all over the universe. Just like waiting for a bus on a sweltering hot summer day can seem to take forever, spending time enjoying a cool drink with friends may seem to pass too soon. In other words, different people or different events depend upon how the viewer sees them. A million years may seem like a blink of an eye for a space traveller in a high-speed spaceship or for someone falling into a black hole.

Space and time are tangled together in a sort of a four-dimensional fabric called space-time. Space-time is like a piece of spandex with four dimensions. When something that has mass - you and I, an object, a planet, or any star - sits in that piece of four-dimensional spandex, it causes it to create a dimple. That dimple is a manifestation of space-time bending to accommodate this mass.

When space-time (or the spandex), is bent, a curvature takes place in its path, which is referred to as gravity. For an even simpler explanation, physicists Mathematical calculations point to the theory that one can go backwards or forward in all the three dimensions, but in this four-dimensional space-time, we're only able to move forward in time.

Famous physicist Stephen Hawkins points out another interesting aspect. According to Hawkins, since we have not met any travellers from the future, it is quite evident that even if years from now, time travel is undertaken by people, they will only be able to go forward. A simple, but profound observation, to say the least.

## Fourth Dimension Travel Guide

Physicists have chalked out a flight path for time travellers by putting forth some interesting ideas. The most popular route seems to be one that goes through a wormhole, which is a hypothetical tunnel present in areas of the cosmos connecting two sides of space-time. These two regions connected by the wormhole could either be bridges joining two different times in the same world, or two parallel universes. Travelling through the entrance from either side would deliver matter to the other side of the wormhole - a phenomenon often used in sci-fi movies and books.

Wormholes are the future, wormholes are the past. But we have to be very careful. The gasoline necessary to energise a time machine is far beyond anything that we can assemble with today's technology. When trying to punch a hole into the fabric of space-time would need the energy of a star, negative energy or some sort of exotic energy which amounts to less than nothing.

On the other hand, many people who study the subject doubt that the approach has any chance of working. But the basic idea , if we're very, very optimistic is that if you can fiddle with the wormhole openings, you can make it not only a shortcut from one point in space to another point in space, but a short cut from one moment to another moment in time.

For aspiring future time travellers, there is also another interesting theory: Cosmic strings are theorised as narrow tubes of energy, which stretch across the entire length of the universe and are leftovers from the early stages of the cosmos. These spaghetti-like strings of energy are presumed to contain enormous amounts of mass enabling them to warp the fabric of space-time. When one compares cosmic strings to spaghetti or spaghettio's we find that these tubes of energy exist either in loops or infinite strings without ends.

This is a project that a super civilisation might attempt. It's far beyond what we can do but We're a civilisation that's not even controlling the energy resources of our planet.

## Building a wormhole

To further make wormholes simpler to understand, physicists compare the universe to skin of an apple, topologically speaking, if a worm tries to crawl to the diametric opposite point, it saves time by boring its way through the apple rather than taking the ‘round trip' from the outside. Additionally, in order to bring two points close together, one can bend a sheet of paper by folding it. This is similar to a wormhole, which has more than one point of entry and a tunnel-like ‘throat' in the middle. In the same way, cosmic wormholes can be used to bring two points in time together or to travel to another point in space-time by entering from one opening and exiting from the other.

## Can we build one?

According to quantum physicists, they would be highly unstable just like a time machine. For one, it cannot be predicted when or where the wormhole might lead. So, as Star Trek fans might think that one can time one's exit from a wormhole to land in London in the year 2079, present theory says it is difficult.

But scientists say that a type three civilisation that is advanced enough and has learnt to harness the energies of its galaxy has perhaps mastered vortexes and possibly time travel as well. This is because they would be far advanced in their knowledge and technology to unravel the mysteries and use the energies present in the cosmos to their benefit. Does such a civilization exist? That is another story in physics. As far as we Earthlings are concerned, we are just on the threshold of being a type one civilisation.

## If I could turn back time…

While travelling to the future is a theoretical possibility, going back in time does not seem to be a possible or plausible idea. For one thing, we are what we are because of who we are. Even if a slight change occurs in the event of someone visiting the past, the entire future of space-time would change. A slight interference in the events that followed up to the present times are the result of everything that took place in the past. And so, there is a chance that the past might be violated or damaged if a times traveller interferes. That is possibly the reason that scientists feel that though travelling to the past does seem like a theoretical possibility, it is also not good for ‘practical purposes'.

Time is like a meandering river flowing through space. As this ‘river' flows through the cosmos, it has whirlpools that might be openings into entering and travelling through it. The best vehicle would be a black hole. But with present theory, anything that goes through a black hole would be ripped at the very atomic stage. Unless an equation is invented to bring people out at the other end without being torn to shreds, we still await the much-needed time machine. But even then scientists feel there is no going back.

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• Skylar Wainland

6 years ago

I am only 9 and have a theory in the 4rth demintion every thing is just pure infinite energy in the smallest messurment of time each has a different pattern if some one could keep there own patterns they could go into time we could replay time by making the exact amount of energy pop but first this theory is based partly on the higgs boson which we may not find for several years

In mediphore

Times journ is being read on another page while its writing.

• albilal siddiqui

7 years ago

this is bilal siddiqui just want to draw your atmost attention towards my side that is it possible that can we have a machine that can revel past? i think it is possible because whatever we say, in the air, the air molecules collide with our waves and remain in the universe. therefore it is my hearthly advice that please try to think about it..because i will sure prove it.thanks for readind

• ritesh sakure

7 years ago

i think if all are saying that if we want travel in past then there are only 2 possobilities i.e.. We can found any wormhole & to go inside in it wit a space ship or satellite that signaling to us but i thnk that it will not signaling & also some says when any object goes inside wormhole there that will broken ..for that we have make machine for that metal which can not broken that goes wit less damage...but i have ane query that why we didn't done this mission....& for 2nd possibilty that to make a wormhole on earth it is very difficult & who knows when it becomes but for tthat sir mallet were still tryinggg...

• AUTHOR

hassam

7 years ago from Pakistan

Yes, time travel in the forward direction is some thing I too support strongly and it is a proven theory of Einstein. Let's how the technology of the newer future makes it practically possible.

I will be checking out your links too. Thanks! :)

• BlissfulWriter

7 years ago

Time travelling in the forward direction is possible and the "time dilation" effect of relativity can be measure with very precise clocks even on a commercial airliner. Time travel in the backward direction is much more difficult. Although physical laws does not prevent time travel in the backward direction and there are many different ideas of doing it, it is highly improbably that we can achieve it due to vast amount of energy and technology needed to implement these ideas.

More about that here: https://hubpages.com/hub/possibility-of-time-trave

I recently wrote about the paradoxes of time travel (such as altering the past so that the future can not happen, etc) in https://hubpages.com/t/2173c1

• yash

8 years ago

science will win

• peterxdunn

8 years ago from manchester uk

Scientists will, one day, be able to build a time machine - they'll just need to read my stuff first.

Another great Hub Hassam.

• hello dave

8 years ago

Great hub, very informative and thought provoking.

• AUTHOR

hassam

8 years ago from Pakistan

Hi, thanks for these additional resources, they will create a better visual understanding about time travel among people.

• ss sneh

8 years ago from the Incredible India!

• ss sneh

8 years ago from the Incredible India!

Hi! Nice hub!

Thanks for writing your view about one of the hottest topics of our modern times- The Time Machines!

However, if you go to scientific community- science journals and science magazines like Scientific American and physics forums-

there, every Tom Dick and Harry and their friends talk about going back in time!

Physicists like KIP THORNE formulated time travel theorems- which allow us to go back in time- more than two decades ago!

And do you know? We have already started constructing our first time machine!

Guess what? Where will this first time machine lead us?

...To The PAAASSSSTTTTT!

Well, realize the fact that "present" is unique and it always communicate with the "past" and the "Future" to make it "Unique".

So if I go back- now with a time machine - to 1902 (3 years before the formulation of special theory) and convinced Einstein to leave physics and concentrate more on learning violin, then that event would have had the consequences on the "present" now - like you argue.

However, since we know that Einstein continued learning physics and formulating special theory and published it in 1905...no event can further happen in history.

So, by applying this logic, time travel will be more safer and less interesting than a common man normally thinks...

Yes I do believe that the mankind is now matured enough to invent a time machine just like the way we control nuclear forces!

-- Thanks

• MistHaven

9 years ago from New Jersey

I liked this Hub a lot. As much as I would like to believe time machines can be built, I don't think they ever will be. For one, technology that powerful would most certainly be abused somewhere down the line. Time machines hold so much potential, but unless it was policed, like say in the Journeyman Project games for the PC, it would get out of hand quickly. Plus, we would probably know if someone was jumping through time, because nothing stays secret for too long.

• Waren E

9 years ago from HAS LEFT THE BUILDING............

This is a very open minded and logical hub,I believe the wormholes would more allow inter dimentional travel rather than time travel,its possible that there are more laws of physics and hidden factors that would prevent time travel even if a worm hole becomes available!

• dutch84

10 years ago

I'm linking you to my hub:

• AUTHOR

hassam

10 years ago from Pakistan

Einstein was the first person who laid down the theory of relativity and gave us theory that we can get ahead of time,and it was from that point people started to think of time travel and many sci-fi movies flourished on this concept before him scientists never even wondered about it in theory. I think it would take another intelligent person like Einstein to to give us a principle of time machine but no one knows when this person will be born among us.

• Rochelle Frank

10 years ago from California Gold Country

Very interesting.

You said:

&quot;Famous physicist Stephen Hawkins points out another interesting aspect. According to Hawkins, since we have not met any travellers from the future, it is quite evident that even if years from now, time travel is undertaken by people, they will only be able to go forward. A simple, but profound observation, to say the least.&quot;

Have we met any travelers from the past? .. or has no one before ever understood the necessary theories?

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