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We don't know why it is that light is a constant and everything else is relative. Our understanding does not reach there. And we can't go faster than light because of the "conversion" of the energy of acceleration. It acts in a way that requires continually more energy be applied in an attempt to push an object closer to the speed of light. The more energy we apply, the more "resistance" to acceleration we'll encounter. And we cannot ever push the object to the light speed threshold. It is a real "barrier" in that sense.

As regards time moving backwards, that is a speculative concept. If time slows down for an accelerated frame (for someone moving really, really fast), it might "stop" and "move backward" as the frame moves to and through c's barrier. (The speed of light is often seen designated by c.) It might be possible to move back in time, but we don't know if this is possible. We have no physical way to test it now, and one is not on the horizon. However Einstein said that it takes an infinite amount of energy to achieve light speed and there is no such thing, see theory of relativity for more info

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What travel fast light or sound in the universe?

Light travels faster than sound in the universe. The speed of light in a vacuum is about 299,792 kilometers per second, whereas the speed of sound is significantly slower at about 343 meters per second in air.


What is the fastest thing that can travel?

The answer to "What is the fastest thing that can travel?" is light. Light can travel faster than any other thing in the universe!


How fast does your universe travel through space?

Our universe does not travel through space in the traditional sense. Instead, objects within the universe, such as galaxies and planets, move relative to each other due to the expansion of space itself driven by dark energy. This expansion is happening at an accelerated rate, but it's not like a moving object in the traditional sense.


What is the meaning of FTL?

FTL stands for Faster-Than-Light, a concept in physics referring to travel or communication exceeding the speed of light. In science fiction, FTL is often used to explain how spacecraft can travel vast distances across the universe in a reasonable amount of time.


What is the FTL paradox and how does it challenge our understanding of faster-than-light travel?

The FTL paradox is a theoretical problem that arises when considering the possibility of faster-than-light (FTL) travel. It challenges our understanding of physics because it suggests that traveling faster than the speed of light could lead to paradoxes, such as time travel or violations of causality. This paradox raises questions about the fundamental principles of the universe and the limitations of our current scientific knowledge.

Related Questions

What do you break when you travel faster than the speed of sound?

The sound barrier


Is there anything in the universe that can travel faster than the speed of light?

No, never! it is disproved by Einstein


What happens when things travel faster than sound?

They break the sound barrier and they will reach you before the sound does


Will the universe explode when a faster than light speed hyperdrive is invented?

There is no evidence whatsoever that something like that will happen. What is it about the operation of any hyperdrive that would cause the universe to explode? Certainly there are different ideas floating around as the whether on not faster than light travel is possible, but none of them suggest that if it is possible, that the destruction of the universe will result if the technology is mastered.As to the idea that nothing can travel faster than the speed of light, there are (may be) "shortcuts" in spacetime which, when used, can make it appear that something has travelled faster than the speed of light. There is more to this, but it is carried under the heading of faster-than-light travel and not the "exploding universe" asked about here.One little problem with travelling faster than light is that no matter how it is achieved it is then, in principle, possible to travel backwards in time - which leads to difficult problems if you decide to change your own past. It would seem fairly obvious that you won't be able to, in fact you arrival in the past has already happened. However it is much, much harder to guess what actually stops you changing things. So if supraluminal travel is invented there will be contradictions in the universe. Whether the universe can be self-contradictory is another matter, but if, as we all assume, it can't, then presumablyfaster-than-light travel will only be possible in limited circumstances.


Are there any guns that can break the sound barrier?

Most modern guns DO fire bullets that break the sound barrier. That is, their bullets travel faster than the speed of sound when they are fired.


If time travel was possible could you in the distant future move several light years in a space by traveling close to the speed of light and than traveling backwards through time at regular intervals?

Indeed, time travel, and travelling faster than the speed of light, are intimately related in the Special Theory of Relativity. Looking at the situation from the other side, if it were possible to travel faster than light, then from some point of view, you would be travelling backwards in time. For more details, read about the definition of "simultaneity" in the Special Theory of Relativity.Probably none of the two is possible - travelling backwards in time, and travelling faster than light.Indeed, time travel, and travelling faster than the speed of light, are intimately related in the Special Theory of Relativity. Looking at the situation from the other side, if it were possible to travel faster than light, then from some point of view, you would be travelling backwards in time. For more details, read about the definition of "simultaneity" in the Special Theory of Relativity.Probably none of the two is possible - travelling backwards in time, and travelling faster than light.Indeed, time travel, and travelling faster than the speed of light, are intimately related in the Special Theory of Relativity. Looking at the situation from the other side, if it were possible to travel faster than light, then from some point of view, you would be travelling backwards in time. For more details, read about the definition of "simultaneity" in the Special Theory of Relativity.Probably none of the two is possible - travelling backwards in time, and travelling faster than light.Indeed, time travel, and travelling faster than the speed of light, are intimately related in the Special Theory of Relativity. Looking at the situation from the other side, if it were possible to travel faster than light, then from some point of view, you would be travelling backwards in time. For more details, read about the definition of "simultaneity" in the Special Theory of Relativity.Probably none of the two is possible - travelling backwards in time, and travelling faster than light.


Do astronaut travel at the speed of lite?

yes they travel faster No.. No they don't. Not even close. I've heard two theories regarding things that are faster than light. Which are the expansion of the universe and a Polarization Synchrotron device that makes radio waves travel faster than the speed of light. http://www.universetoday.com/2009/06/30/device-makes-radio-waves-travel-faster-than-light/


Do asteroids travel faster than light?

No, asteroids do not travel faster than light. Light travels at a speed of about 186,282 miles per second (299,792 kilometers per second) in a vacuum, which is the maximum speed at which anything can travel in our universe. Asteroids typically travel much slower than the speed of light.


Why were the rocky mountains a barrier to travel and settlement?

They are a barrier to travel and settle ment because of the snow and there peaks


Which travels faster?

The speed of light (ca. 300,000 km/second) seems to be the speed limit in the Universe. Nothing is known to travel faster than light; it seems likely that travelling faster than light is not possible.


What rate of speed is necessary to break the sound barrier in mph?

The speed of sound is approximately 767 mph at sea level. To break the sound barrier, an object would need to travel faster than this speed, so it would have to be moving faster than 767 mph.


How can the universe have a greater distance than its age if nothing can travel faster than the speed of light how is it possible that it is larger than 13.7 billion light years?

Nothing within the Universe can travel faster than the speed of light, but the Universe itself expanded to most of its present size with a rapid expansion event very early during the Big Bang. This rapid expansion occured independently of the laws which function within the Universe (i.e. those which limit speeds to c).