Michio Kaku: The Physics of Back to the Future- The River of Time

[mideastatheist]

if you go back to the past and kill your grand father

. then you wouldn't exist .

but who killed your grand father if you didn't exist ??

[GarethLW1893]

@mideastatheist

See parallel universe theory.

[deanmullen10]

isn't a rock on the moon a time traveller in the sense time goes faster on the moon slightly? yet that rock has been on the moon for perhaps billons of years? so relative to the earth there is a rock that is much younger than it shud be.

[PsycheDelectic]

He's forgetting, Back to the future is not the only show that talks about time travel in terms of splitting timelines.. Dragon ball Z

[gregorywruiz]

You guys smoke too much pot.

[CoreyfromEarth]

Very very cool! Makes me love this trilogy even more!

[TonyN737]

If you went back in time six months ... wouldn't you find yourself floating in space on the opposite side of the sun, where the Earth was six months ago?

[amsd1231]

@TonyN737 IF you put the sun as the center. If you put Alpha Centauri as the center then you would be farther away from the earth. It's all relative, so it all depends where you put the center.

[deanmullen10]

@TonyN737 you would, thats the difficulty along with the fact we don't know how to do it yet ha, but yeah thats true.

[MrIceBrick]

@TonyN737 and thats why if you ever to come up with a way to travel back/forward in time it would probably have to be in whole years, otherwise i believe you would be correct lol and you would, most likely, die X__X

[MrIceBrick]

@TonyN737 and thats why if you ever to come up with a way to travel back/forward in time it would probably have to be in whole years, otherwise i believe you would be correct lol and you would, most likely, die X__X

[MrIceBrick]

@TonyN737 and thats why if you ever to come up with a way to travel back/forward in time it would probably have to be in whole years, otherwise i believe you would be correct lol and you would, most likely, die X__X

[GarethLW1893]

@TonyN737

Let's assume that the time spent at 88mph is t (t is very small), the time t is spent in the Earth's gravitational field, so when you head say, 6 months into the past, you are traveling for 6 months through fourth dimension whilst still in the Earth's gravitational field, so whilst t is still very small, throughout the journey through time, you remain in the Earth's gravitational field as it goes around the sun.

[TonyN737]

@GarethLW1893 Interesting, thank you!

[PlayHiFi]

@TonyN737 I'm a bit confused =?

[SearchZoneGaming]

@PlayHiFi Earth rotates around the sun. As the Earth rotates around the sun it is changing its position, along with the fact that our galaxy is spinning and our universe is expanding. So while if you were able to move into the past, you would not be on the planet because it would have moved position, as would the sun and the galaxy.

[PlayHiFi]

@SearchZoneGaming Thanks Tony. After reading your first comment again 2 weeks later, I got it right on. Thanks for dummy prof reply. Now we need to work on a relative-2-time motion tracking system 0.o

[bugg333]

@TonyN737 yes, and the earth would be there too

[TheMidwestsk8ter]

@TonyN737 Lol damm that just changed my whole view of time travel

[U5011453]

@TonyN737

Yes but earth would be there too I guess, everything will be as it was six months ago.

[ReassuringSmile]

@TonyN737 You including EVERYTHING will be as is 6 months ago. unless you warp into another multiverse

[tkoizumi]

Cont... So all these science fiction movies regarding time travel got it wrong. To be more precise, Time, is actually an illusion. A concept of measurement that the human have created to explain the finite point of event from the limited perspective of human understanding. If you some how let go of the notion of time being a straight line like a "timeline" and instead think of time as an infinite sized messy ball of yarn, you can perhaps imagine that time paradox is not really a paradox anymore.

[DrKillaser]

@tkoizumi didn't they do an experiment by putting a clock on a very fast jet, then when the jet stopped.. the clock was late by one second?... and Apollo astronauts' clock was late by 2 seconds when they arrived to the moon?

[tkoizumi]

@DrKillaser Yes, they were trying to prove the Einstein theory of time being relevant. This is a good example of how we know little about what time is. So like I've said before, time is never a simple straight line. It's a very flexible and yet infinitely complex interwoven line.

[DrKillaser]

@tkoizumi o.0.. did i mess replied?.. i was replying to a comment where it was written with the meaning of "time is a human made scale to measure when the events happen and nothing more".. o.0

[tkoizumi]

The problem with human mind when it comes to time is we can only perceive time as Past, present, future. So we can only view the 4th dimension with a 2 dimension perspective. When we make a decision in our lives, we are actually creating parallel universes. Now imagine for every event that can, will, may happen are woven into one single point. That right there is the 5th dimension. On that plane, you can violate the time paradox. So killing yourself in the past won't effect your existence.

[solarfar]

every one to there own jeffry.

[michelXShawn]

i used to love you michio, but now your waisting all your time for T.V. shows, im sorry but you're not number 1 in my eyes anymore. drop the videos and start research and i will love you again.

[TheDeedzman]

@michelXShawn so who is your number 1 now?

also: i agree, however he does well at explaining things to dumb people.

[michelXShawn]

@TheDeedzman its a hard toss up but i would have to say Nathan Seiberg first, Michio second, and probably Stephen Wolfram third.

[jyeotis]

@solarfar No one "created" the big bang as the model is accepted at this time. Take your bronze age superstitions elsewhere, they have no place in science.

[charliemant]

Mr. Kaku I am a big fan of yours and I have a question? Why is space cold? Where does cold weather in space come from? What creates it?

[lovestospoodge1]

@charliemant the abcense of heat does...

no sun, no heat = coldness.

[DOHC2L]

@charliemant Cold is the absence of heat. Heat is something that's measurable unlike coldness. And there is no weather in space; 99.8% of space is void of mass.

As for your last question; God created the universe and everything within it.

[jyeotis]

@charliemant There is no weather in space. There is no atmosphere in space to allow weather to occur, nor to hold in heat. But, space is not necessarily cold. It depends on where you are. If you are in the corona of the sun, it is unimaginably hot. Yet, if you are orbiting Neptune, it is unimaginably cold.

[Mworuke]

Interesting! I watched a lot of your videos until this morning.. Now I'm going to sleep

[normanhayes]

like in that song Time by The Alan Parsons Project.

[MurdocLC]

Aw yeah BTTF pwns!

[RafaLee188]

If you go back in time and create a new timeline when you go back to the future would you go back to your own future or to the future you just created?

[Alphapointer]

Michio Kaku believs in everything. But I like it.

[setiamalaysia]

... not there, gone.

[setiamalaysia]

If we want to experiencing time is going backward, I believe it is not possible because each of the objects are constantly changing they will not able going back to the same shape again in same time space. For example starlight that we are observing now they are travelling forward either in straight line, bended or warped. The light the space events we saw should be happened long time ago although we able can see the event which as happened but in present time that object should be changed...

[setiamalaysia]

When we in a capsule experiencing time is slower down in our confined space because all the electrons movement, proton and neutron vibration is getting slower. We will feel that we are "Back to the future" in seconds or minutes by using our earth time as benchmark gauge but it is meaningless if the earth time does not exist we will still using the time we are experiencing in our confined space as the benchmark.

[JohnnyMuffintop]

I idolize Kaku, as well as the way he speaks of various science fiction scenarios in practical ways, but I still want to know whether or not he's seen a film about time travel called "Primer".

I'd LOVE to hear his thoughts on it.

[edstar83]

Back to The Future is one of my favourite childhood movies. My brother and I must of watched it a zillion times growing up. I'm still not sick of it yet.

[bubbyslife2]

he knows so much more, but cant tell us. wish he dident work for the government

[gamehero77]

I think i get it. Lets say you wanted to go 500 years into the past, you could go into a universe spawned 500 years after this one that developed the exact same way that our universe did. So in said universe it just got to the point where our universe was 500 years ago. Such a universe would exist because there are infinite ways universes could develop.

[FiniteLoss]

My take on the impossibility of time travel into the past:

david.tribble.com/text/timetra­vel.html

[DoNotLaughAtMe]

@1scifreak That's cool, good thing I'm not the only one thinking about it. I was thinking when they send clocks to space, all the speed, heat makes particle move faster or something. well idk something like that.

[AlkaiserNeo]

Michio Kaku is probably the only man I truly respect.

[soasertsus]

@AlkaiserNeo Seconded.

[BusinessEdgeRadio]

Backwards time travel can not be possible because that would mean there is one of you being made every nanosecond. 

[trtnec]

@BusinessEdgeRadio you've never heard of quantum mechanics have you... most top physicists, based on the absurd results of quantum experiments, believe exactly what you just said was impossible. Also Einstein's general relativity allows for backwards time travel. People like us probably shouldn't comment on what is or isn't physically possible when we know so little about the universe compared to people like theoretical physicists, unless you can do it in non-vague language like them (math).

[BusinessEdgeRadio]

@trtnec quantum mechanics has nothing to do with it. Steven Hawkings himself said backwards time travel wasn't possible for different reasons due to feedback. But look if you are able to go to the past and see yourself that would mean there are billions of you existing in moment of different time. So if you went back 1/10 of a sec there is another you and if the both of you went back together you there would be 3 of you ect..  backwards time is a thought not a "place".

[trtnec]

@BusinessEdgeRadio Again, I'll trust the implications of Einstein's equations, equations which have never been tested to be wrong in history, over your gut feeling.

And if you think the math you just used was what I meant when I said you had to use math to argue physics, please, just stop. Stop and go read a physics paper on these subjects.

[BusinessEdgeRadio]

Also logically if backwards time travel was possible there wouldn't be any religion today as an atheists from the future would have gone back and killed off Muhammad, Jesus, Moses etc

[trtnec]

First of all, I want to make it clear that I'm not saying anything is fact until it's demonstrated. But if you listened to Kaku's point in the video about how time travel to the past brings you to an alternate world decohered from ours, you wouldn't have argued this point.

Also, if you consider your point as logic, and that's the first thing that came to your mind if backwards time travel were true, I need to end these comments...

[DOHC2L]

@BusinessEdgeRadio Why do you call it backwards time travel instead of just time travel? There's never been a need to stipulate the direction. Although we're arguing theoretic temporal mechanics, some things are just common-knowledge. And I think most atheists would be appalled at those comments, really you sound like a Nazi when you say such things.

[BusinessEdgeRadio]

@DOHC2L You think I sound like a Nazi cause you're retarded and you want to feel like you matter. Religion is a scam that has fooled billions, now stop talking to me because you too stupid for my time.

[trtnec]

@DOHC2L He calls it backwards time travel vs. future time travel because they are completely different. Forward time travel happens ALL the time everywhere, (although it is in most cases extremely slight), and it is described in Special and General Relativity. And by time travel I obviously know that time is relative, so time travel is relative as well. Muons time travel drastically in reference to us when they travel at 99% the speed of light and then come to a stop but not to another muon.

[jyeotis]

@BusinessEdgeRadio Three things, one you are assuming that an atheist would be devoid of morality enough to kill said prophets. Two, a new universe would branch from this one to allow for the acceptance of such an event. And three, you can only travel backward in time as far as the first working time machine is turned on, such as Neil deGrasse Tyson talks about with his "coffee" example. Therefor, given these three arguments I must refute your logic as fallacy. Specifically as a false dichotomy.

[samfarking]

@BusinessEdgeRadio Or go back in time and warn humanity of impending doom and in doing so appear like prophets such as Jesus, Moses, Muhammad etc.. jus saying

[gamesmaster35]

@BusinessEdgeRadio as far as we know some atheist named Judas went back in time befriended Jesus, became a disciple with the the plan to betray him to the romans and was accidentally responsible for giving birth to the whole Christian religion.

[nintendomaster9793]

@BusinessEdgeRadio but then wouldnt the same hold true for a religous person? Couldnt he/she go back adn just keep them intact? or even prevent the atheist from going? on second thought, forget it. i can tell this argument will never end lol

[p94mitch]

@BusinessEdgeRadio how can he kill 3 people that didn't exist 

[futurestoryteller]

@BusinessEdgeRadio Retroactive genocide, that's exactly what you need in order for the religious to accept the fact that you have morals... What a fucking idiot.

[DOHC2L]

@trtnec "Einstein's general relativity allows for backwards time travel." No it doesn't. You've gone from science to speculation. General relativity is not time travel; General relativity accounts for differences in time (temporal) measurements, explaining why small moons orbit planets at very high speeds but also why other celestial bodies big or small and what affects are there on those motions. Relativity completed Newton's classical physics, and both methods rely on MEASURING time only.

[trtnec]

@DOHC2L I knownthe gist of General Relativity, and one of the things it does is describe time travel. Time dilation is time travel.

Also, I've heard many physicists, including Kaku and Neil Tyson, say that there is a solution to General Relativity that warps space so severely (essentially) that it brings you back to a previous point in spacetime. I'll trust what they say over you. They say time travel is physically possible based on the equations, but we don't have the means to do it.

[PinkProgram]

Ummm... changing events in an alternate timeline would have no effect on the primary timeline. If you return to your own timeline nothing in the past would have changed. The problem is jumping forward while still within the alternate 4 dimensional axis created by your initial sideways jump. Killing Hitler in an alternate timeline will not change the events of WW2 in this one.

[AdamhaiderTV]

Quantum Leap is another great time travel movie. :-)

[omaraty009]

@AdamhaiderTV its a series..but yeah ..seconded.

[1avandeira]

Time traveling forward is possible, backwards I'm not so sure, I'm positive that if men would ever get that power, we would have already seen someone coming back and telling us "you are all idiots and you messed up the world". I think the biggest issue with time traveling is that if in fact Einstein's theory about it is correct, and time is like a flowing river able to fork in different streams, how do you secure not getting lost between streams, or dimensions?

[ForceOfWizardry]

This is why "back to the future" was the best films in human history

[AdamNiSpain]

Epic

[Platemaster]

That's why I'm going to buy a DeLorean just incase.

[VennomX32]

Awesome!!!!! 

[pwed546]

OH HELL YES