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# Why does traveling faster than the speed of light mean time travel?

Why does traveling faster than the speed of light mean time travel? Lets say I was on earth and I shined a strong laser towards a person living on neptune( I know it isnt possible but please work with me here!) , and then If I traveled to neptune in one second, how would that make me travel through time? Would I just be in the same location as the Neptunian?

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aaron

i heard that if your in subzero temperature time stops

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Saint Onle

This comes from Einstein’s theory of relativity. Specifically special relativity. Einstein showed that because the speed of light is constant in every reference frame, the time measured by observes in different reference frames is different. The equations show that it is impossible for a massive object to travel faster than the speed of light. All massive objects must travel slower than the speed of light. However, they also imply that an object traveling faster than the speed of light (and with imaginary mass, whatever that means physically) would travel backwards in time. This is were it comes from, Einsteins equations… Read more »

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Steve Biski

Traveling at the speed of light does not represent time travel. In fact, according to the theory of relativity, mass moving at the speed of light is impossible. As you approach the speed of light, according to the theory, your mass would increase, and the force required to keep accelerating would become larger. If you ever neared light speed, you would achieve infinite mass, and require infinite amounts of force to keep moving, thus making traveling at light speed impossible.

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Kiki

traveling at the speed of light doesnt necesarily mean time travel. traveling at the speed of light just means you can move at the same rate that light does, but depending on where you are, it can mean “going back in time” if you will. it takes the light from the sun around 7 or 8 minutes to reach earth. so lets say you wanted to go to mercury, if you traveled at the speed of light, it would mean that you would be going about 7 or 8 minutes ahead of time, for the light to reach mercury (hopefully… Read more »

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Jeremy

regarding “F H”s answer- Time is just a concept, an idea. it does not exist, in my mind its an attempt to understand existence. therefore that E=MC2 is not true for the time part.

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Bivek

It is called time travel because different planets have different time period to be consider as a year. If you go to neptune and stay there for 3yrs(neptune time) and come back to earth then you’d not passed 3 year of earth, so you are not 3 year old for earth comparing to the time you pass in neptune. And speed of light is not affected by friction so light has highest speed in this universe.So traveling faster than the speed of light mean time travel. Hope it helps.

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BD

Well, because of the theory of relativity, the faster you go, the slower time is for everything around you. Also, just because you’re traveling faster than the speed of light, it doesn’t mean that you’re time traveling. That’s a movie cliche.

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Pathankrious Shark.

the idea is that the faster you are the slower time moves, so if you went light speed for 10 years, it probably would be 50 years earth time…so if you went faster, time would move slower.

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F H

It’s believed by some that as you accelerate time slows. Once you reach light speed 186,000 miles per second time would stop if the theory is correct. E=MC2