If one could travel at the speed of light. Would time_travel be possible?

Answer 1

RELATIVE time slows down at speeds slower than light, but time is still moving forward.

In an experiment about 20 years ago, university professors circled the globe traveling on commercial airline flights, and carrying highly accurate chronometers. So they probably never went faster than 550 miles per hour. They found that over time, the chronometers actually measured less time than the amount of time that had elapsed on the ground.

So relative time can slow, but time reversal (traveling backward) is probably more theoretical than practical. In order to approach the speed of light, one has to expend an amount of energy that has never been expended in any single space voyage. And no real scientist has ever proposed spending that much energy on one project.

Then you have the philosophical problem that the moment in time you are looking for happened only in one point in space.

The earth is spinning, and the earth is revolving around the sun, and the entire solar system is moving inside the Milky Way. Some people thing that in order to move back to a moment in time, you have to find the exact spot where an event happened. So to go back 10 years, you have to calculate where the place on Earth was, with respect to the solar system, and where the solar system was with respect to the Milky Way. That's calculating the motion of a point on a spiral 7,000 miles in radius inside an oval 93,000,000 average miles in radius, inside another spiral hundreds of light years across.

And as long as we are staying philosophical, the next question is whether you can get to the place you want to go, in a straight line, or whether you have to recreate the spiral motion backwards, to catch all of the reflections of time. The math alone would be "astronomical".

Leave time travel to Captain Picard, and theoretical ruptures in the space-time continuum.

Answer 2

If you could accelerate at the speed of light without being vaporised and you then travelled for 5 yrs at that speed by the time u returned u will have only aged by 5 yrs while everyone else would have aged a lot more theoretically possible the only way that it could be achieved would be to have a craft large enough to accommodate a reasonably long lasting biosphere
it would then have to be able to accelerate constantly over a long period of time to enable the crew to adapt
this crew would have to be large enough not only to run the ship but to have families while on the journey because it would take Such an unreasonably long time to accelerate to the speed of light and then slow down again safely, that if the ship survived and didn't crash into anything or be crashed into then it would be the crews great great great great grandchildren who would arrive and not the original crew hence the large self contained biosphere the problems with biospheres is that it is incredibly hard to have a fully closed system u have to recycle all of your food, air, water, clothing, wastes etc
So it is impossible to have a fully closed system for any reasonable length of time so even if you could build the ship the biosphere would let it down millenia before it arrived back home

Answer 3

The flow of time is different in different places. For example, the GPS system is accurate for most users to about 30 feet. Yet scientists can get measurements accurate to about 1/100 of a centimeter. Why? The difference is they compensate for the different flow of time for the satellites in orbit, compared to the time flow on the surface of the earth. In other words the flow of time is affected by mass.

In the question of traveling at the speed of light, the people in the space ship would sense time flowing exactly the same as those at rest on earth. Wnen they returned from their journey, everyone they knew would probably have died years ago. It would seem that time had slowed for them but to their perception that would not be the case. The space travelers would have the same lifespan as those left on earth.

Yet there would no possible way for them to return before they left. What actually happens is that they are in a place where time flows at a slower rate, yet to the individuals this difference is not perceptable. Hence, it is not possible to move forward or back in time by space travel at the speed of light. There are many good science fiction stories that deal with this paradox, that once interstellar travel is achieved, the problems that will arise. One could not travel to another star system and expect to return and ever see any members of one's family again. Hope this helps.

Answer 4

well first of may i say exactly how do u define time.
it is belived that time moving foward is defined as an increase of entropy.
second as speed incrases so does mass and therefore the energy required to reach that speed would just not be avalible.
thirdly the slowing of time is based on pythgoris theorm if u reach the speed of light according to pythagoris therom u will get a value over zero which is undefined.
it is belived that traveling back in time is possible via a "wormhole" but going the speed of light is not the way

Answer 5

Suppose astronomers travelling in shuttle and revolving around the earth. Astronomers observe that sun is rising and setting at rate 6 times as usual rate. That means astronomer observes a day of time only 4 hours. That means astronomers observe 6 days in 1 day. that means Astronomers traveled a time.
Suppose if a person travel for 6 or 7 hours and when return to home, he observe that conditionof home is same and nothin gis changed. He traveled time. If a one travel at the speed of light.
He travel very very long distance in very very less time.
I am supposed this is the time travel.

Answer 6

I don't see how the two are related? Are you suggesting that one relies on the other? Why?
Is this just Sci-Fi folklore or do you have a basis for this Theory?

Most people will argue that time travel can't be achieved. The same people would struggle to explain why two masses exert a gravitational force on each other, or how an electrical current actually produces a magnetic field. They may be able to explain the way each can be calculated but struggle to explain why.

If they can't get their head around two very easy to observe effects, then how do they expect to understand Time travel?

Answer 7

the only thank you to respond to your question is thru toying with the mathematics. It will become a theory test. Einstein's equations instruct that as you concepts-set the fee of light, or c, your mass starts off to advance. So does the ability required to enhance up you added. The nearer to c you get the greater super you adjust into on an ever-increasing curve. That curve will never extremely touch c. Is is asymptotic (look it up). What does that mean, in English? It ability you won't be able to get to the fee of light, no rely how huge your engines are. Your mass could exchange into endless - the load of the standard universe could be *precisely* as some distance below yours as is a million ounce. this is a troublesome theory to wrap your head around. to assert there is no standard ability source able to pushing you that quickly is deceptive. if fact be told, back, the quantity of ability required you be endless. that would not propose very super. Infinity lies off exterior the area of actual numbers. it is not proper how huge your selection is. Any selection you pick for - a million,000,000,000,000 x the full universe - is *precisely* as some distance from infinity via fact the selection one. Going that quickly isn't in basic terms difficult, no longer in basic terms previous our technologies, yet is quite no longer a threat. in any respect. So... no, it is not a threat to apply FTL as a time gadget. Sorry.

Answer 8

If i remember, Einstein said that traveling faster than light would reverse time. The more likely time travel method is a worm hole, but the limit there is that you can never go back farther than the time when you opened the hole - so you ain't going back to see the dinosaurs if that is what you want.

the real question is, if you are traveling at the speed of light and you turn your headlights on, do they work?

Answer 9

Whilst a good question and something to think about, it has been scientifically proven that traveling at the speed of light is impossible. I could explain but would take to long. It all comes down to Einstein and his equations. i.e. E=m(c^2).

Answer 10

I don't see how this would make it possible it's like if you make a cup of tea with sugar, milk etc and stir it up theoretically it is possible to separate it back into its constituent parts if you recreate the moves backwards and the speed at which you stirred it.But the very fact that you are moving forwards already has taken one of the variables away making it surely impossible to reverse the process.