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Is Time Travel Possible?



Uploaded by: fabirebeque
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Is time travel possible? Theoretical physicist and 2057 host Michio Kaku explores the possibilities.


Tags for this video: Channel Discovery Podcast Time Travel

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By combining space ... ( 23 hours ago by alwebste)
By combining space and time into a single manifold, physicists have significantly simplified a large number of physical theories, as well as described in a more uniform way the workings of the universe at both the supergalactic and subatomic levels.
By combining space ... ( 23 hours ago by alwebste)
By combining space and time into a single manifold, physicists have significantly simplified a large number of physical theories, as well as described in a more uniform way the workings of the universe at both the supergalactic and subatomic levels.
The equations used ... ( 23 hours ago by alwebste)
The equations used in physics to model reality do not treat time in the same way that humans perceive it. The equations of classical mechanics are symmetric with respect to time, and equations of quantum mechanics are typically symmetric if both time and other quantities (such as charge and parity) are reversed. In these models, the perception of time flowing in one direction is an artifact of the laws of thermodynamics (we perceive time as flowing in the direction of increasing entropy).
The equations used ... ( 23 hours ago by alwebste)
The equations used in physics to model reality do not treat time in the same way that humans perceive it. The equations of classical mechanics are symmetric with respect to time, and equations of quantum mechanics are typically symmetric if both time and other quantities (such as charge and parity) are reversed. In these models, the perception of time flowing in one direction is an artifact of the laws of thermodynamics (we perceive time as flowing in the direction of increasing entropy).
The concept of ... ( 23 hours ago by alwebste)
The concept of spacetime combines space and time within a single coordinate system, typically with four dimensions: length, width, height, and time. Dimensions are components of a coordinate grid typically used to locate a point in space, or on the globe, such as by latitude, longitude and planet (Earth). However, with spacetime, the coordinate grid is used to locate "events" (rather than just points in space), so time is added as another dimension to the grid.
The concept of ... ( 23 hours ago by alwebste)
The concept of spacetime combines space and time within a single coordinate system, typically with four dimensions: length, width, height, and time. Dimensions are components of a coordinate grid typically used to locate a point in space, or on the globe, such as by latitude, longitude and planet (Earth). However, with spacetime, the coordinate grid is used to locate "events" (rather than just points in space), so time is added as another dimension to the grid.
The best-known ... ( 23 hours ago by alwebste)
The best-known treatment of time as a dimension is Poincar
é and Einstein's special relativity (and extended to general relativity), which treats perceived space and time as components of a four-dimensional manifold, known as spacetime, and in the special, flat case as Minkowski space.
The best-known ... ( 23 hours ago by alwebste)
The best-known treatment of time as a dimension is Poincar
é and Einstein's special relativity (and extended to general relativity), which treats perceived space and time as components of a four-dimensional manifold, known as spacetime, and in the special, flat case as Minkowski space.
I think I have ... ( 22 hours ago by altonhare)
I think I have zero'd in on your definition of time: Time: "one way to measure physical change" To measure anything requires comparison to a standard. The radioactive decay of an isotope, the earth revolving around the sun, etc. If there were no sentience in the universe there would be nothing to make the comparison. The earth just is, the isotope just is. Time requires a sentience to do the measuring, it is a concept like love, beauty, justice, or God.
By contrast, an ... ( 22 hours ago by altonhare)
By contrast, an object has length, width, and height all by itself. Nobody had to see a brick for it to have the dimensions of length, width, and height. The brick, the earth, and the atom are physical. Time is conceptual. For the brick to "have beauty" a person had to look at it and decide it was beautiful. For the brick to "have time" a person had to watch it and compare it to the sun's movement, the decay of an isotope, or a watch hand.
Yes, you are ... ( 22 hours ago by alwebste)
Yes, you are getting the idea now. Time is complex to understand, and I think you are comprehending.
I don't want to ... ( 21 hours ago by alwebste)
I don't want to take the credit for the definition, it's not just my definition of time, it is the universal definition of time used by every physicist on the planet.
I think I see your ... ( 21 hours ago by altonhare)
I think I see your definition of space-time: "... any mathematical model that combines space and time..." It is a mathematical model, the dimensions you're talking about are not physical, but mathematical. Inventors have been developing mathematical models for centuries to describe systems and build devices. Mathematical models describe the universe. Physical models explain the universe. Physics studies what IS, independent of an observer. Math studies soley what an observer PERCEIVES.
I don't think ... ( 21 hours ago by altonhare)
I don't think you're getting me. Time is a concept like vengeance or constipation. You cannot dilate, bend, move, or break a concept. You cannot bend vengeance except metaphorically. You cannot physically break constipation into two pieces of constipation. You cannot stretch, bend, warp, twirl, hump, tear, shred, destroy, or immolate time.
First of all, you ... ( 21 hours ago by alwebste)
First of all, you keep refering to these concepts as mine. These concepts are fundamentally understood by every physicist on the planet. Second, you are correct! the dimensions are not physical. You can not use any of our 5 human senses to be aware of the dimension of time. Lastly, I would hope that you would stop trying to 'disprove' the facts I have told you, because I can assure you that you are not disproving anything.
Okay, then you are ... ( 21 hours ago by alwebste)
Okay, then you are not grasping the concept of time at all. I'm sorry.
damn..imagine if ... ( 17 hours ago by BahamasIllestMC)
damn..imagine if people went back in time and killed Hitler an stop the slave trade an stoped 9/11! shit history would be soo different!
this is so true ... ( 15 hours ago by altimexs)
this is so true maybe the so called aliens that visit us are really us from the future? maybe the ufos are really the machines that were used? maybe they look different from us because we evolved.
i thought about ... ( 11 hours ago by IMILLMATIC)
i thought about this big bang reconsrtocktion.
(i know this isnt related, but the video reminded me of it)
have you ever wondered if millions of years ago another species re-created a big bang and it went wrong an all life in the universe was set back to day 1? and now if we create another big bang we will do the same? and then once every billions of years, when a dominating and inteligent species discover the technoligy they will start again? in that case the world is much older than we think
I don't care how ... ( 3 hours ago by altonhare)
I don't care how many other people understand the concepts. I am talking to you and you alone, I want to know YOUR thoughts. Okay, these dimensions of time and the other 6 or 7 or 22 are not physical. That makes sense and I understand. Since they are not physical, what do they have to do with physics? My bat is physical, so it can hit the ball. My determination is nonphysical, it cannot hit the ball or do anything at all physically. So, what do these nonphysical, conceptual dimensions DO?
The rod is made of ... ( 3 hours ago by altonhare)
The rod is made of smaller parts, atoms, that are connected. When you pull on one end of the rod you pull on the atoms at the end, increasing the separation between them and the atoms adjacent (lengthening the rod). The atoms on the end pull on the adjacent atoms, which pull on the next atoms, and so on. This creates a pocket of increased atomic separation (lower density) that propagates along the rod. The pockets will meet and propagate in reverse, arriving back at your hand.
If I move at the ... ( 2 hours ago by altonhare)
If I move at the speed of light does the earth stop going around the sun? Do radioactive isotopes stop decaying? Does that make sense? Or does going at 3E8 m/s simply mean that I traverse a distance in the same time it takes light to? Aaron is right, speed is just speed. Time travel is a self-contradiction, a logical impossibility. It's something physicists have used to hype themselves up to get more funding.
Time travel is a ... ( 2 hours ago by altonhare)
Time travel is a logical impossibility, a self contradiction. Time is purely conceptual, it is not a physical object. You cannot bend or break concepts like love and justice.
At this point you ... ( 2 hours ago by altonhare)
At this point you will feel the rod pull on your hand as it contracts to its original length.



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