Stephen Hawking - Time Dilation

Stephen Hawking explains time dilation.

Into The Universe With Stephen Hawking - Time Travel

This video belongs to Discovery Communications and is being used for educational purposes only.

Category:

Science & Technology

Tags:

• professor
• stephen
• hawking
• into
• the
• universe
• time
• travel
• science
• cosmology
• wormhole
• black
• hole
• physics
• astrophysics
• discovery
• space
• dilation
• einstein
• special
• relativity

[guitarriff1988]

So what about sky scrapers like the World Trade Center or Empire State Building would they slow down time?their mass is 10x heavier then the great pyramids of Giza cause it's all iron.

[WeAreStarStuff51]

@guitarriff1988 The time dilation caused by the pyramids in the video was just an analogy showing the relationship between mass and time dilation. They do slow down time (, as would skyscrapers, since they have mass), but by an infinitesimally small amount. I guess they thought it'd be easier to explain using a smaller mass like the pyramids rather than an object that really does cause signifcant dilation like a planet or black hole.

[guitarriff1988]

@WeAreStarStuff51 Ok,Are those camera affects 4:06 slow motion - 4:51 fast motion

For example if i'm running close to the pyramid would my buddy from further distance see me run that slow 4:06 or if i'm running 15 mph would it be 10mph to him?

And if he's running further away from the pyramid would i see him run that fast 4:51?or if he's running 15 would it seem like he's running 20mph to me?

[WeAreStarStuff51]

@guitarriff1988 If you were to try this with the pyramids you would see that the effect they portray in the video is exaggerated billions of times (3:54) Time would slow down, but it would be impossible to notice without incredibly precise clocks. If you were orbiting a black hole and had a telescope powerful enough to see people on earth then you should see a similar effect to the video. So the mass needed to see this kind of effect is immense and the pyramids, nor the earth are massive enough.

[nickmooreimages]

Since we are closer to the earth than satellites are, why do the satellites experience slower time?

[WeAreStarStuff51]

@nickmooreimages Satellites experience faster time

[rubikfan1]

thats why heavy people run slower,

[dresio666]

I experience time dilation every day in my work

[johntheant]

To the past.

[johntheant]

Who says time travel to the pass isn't possible. Maybe when we are hyperadvanced god like beings we can tweak the universe to make it so we can go back in time. We only dont see ppl from the future possibly because time paradoxes aren't real.

[BlackOpAim]

i want to see more... send me a link to goes to the complete episode

[shis0striker]

@frogfan101 time isnt clocks clocks "measure" time just like rulers measure distances... time is another dimension ( i guess) like space and stuff the pyramids dont slow down the clocks but the time itself

[Honeybadger205]

Mechanics aren't powered by time, they are powered by energy. But time is still tiny fractions faster or slower in other regions or planets in the galaxy, but the clock or watch would show the time on Earth.

[Arvilian]

@frogfan101 how does it run at a certain speed? Is time really "outside"? If something is outside of time, how does it exist on the time-space continuum?

[frogfan101]

i think that time doesent slow your movents down but makes the movments of the outside world faster, and that poeple who are moving fast are really moving normally according to them and so are you when they see you

[frogfan101]

okay a clock is a machiene with runs at at a crtain speed so how can something like time outside effect it. time would have to be energy in order to have enough power to slow down the clock, more like friction. and that would mean that the true time is always the same but there its forced to be slower wich makes you age mormally because machienes humans and time dont seem to be connected anywhare