The Physics of 'Back to the Future' with Dr. Michio Kaku | movie | 2010 | Official Clip - video Dailymotion

The Physics of 'Back to the Future' with Dr. Michio Kaku | dG1fdXZDcDY2QVFablk

Transcript

00:00Come here, I'll show you how it works.

00:02First, you turn the time circuits on.

00:08This readout tells you where you're going, this one tells you where you are, this one tells you where you were.

00:12Back to the Future is novel because you go forwards in time and backwards in time.

00:17And believe it or not, going forwards in time is the easy part.

00:20Our astronauts go forward in time by a fraction of a second every time they go into outer space.

00:30You realize that in outer space, like on the moon, time beats faster on the moon than it does on the earth.

00:36So it is true that if you could race near the speed of light, time begins to slow down so that you rocket into the future.

00:45Of course, we cannot go near the speed of light, but one day we will, and so future travel is a definite possibility.

00:55But going back into the past, aha, that's the killer.

01:03And if you have enough energy, maybe in a DeLorean, you might be able to wrench this river of time and make it fork into two rivers.

01:15According to the laws of physics, according to Einstein's general theory of relativity, time is a river.

01:23It's a river that meanders and goes backwards and forwards and does all these gyrations.

01:29And we now know it could have whirlpools, whirlpools in the river of time.

01:34The time continuum has been disrupted, creating this new temporal event sequence resulting in this alternate reality.

01:41English, Doc.

01:42Here, here, here.

01:43Let me illustrate.

01:44When Doc Brown went to the blackboard, drew the timeline, the river of time, and then drew a fork in the river of time.

01:53Creating an alternate 1985.

01:56That's how we physicists view the possibility of time travel.

01:59You jump from one stream to another stream.

02:02So if you go backwards in time, you enter an alternate reality, a quantum alternate reality.

02:08And Back to the Future, to my knowledge, is the only film which gets it right.

02:13Here we go lobbyist.

02:13Here we go.

02:15Today, we have a chance.

02:16As you

02:26want to enjoy the past time today.

02:30Let me welcome your friends.

02:31Keep on looking for a kiss.

02:33There it is.

02:34Well, thanks for the applause book.