Can you travel in time?

[Max™]

Nope, you would no longer move in time or space. You would no longer be a part of your parent Universe after your mass/density increased beyond it's Schwarzschild Radius.

[thinking]

[quote=hawkingfan1;77444]Well if you are talking about travelling faster than the speed of light then no. It is rather simple really, according to the equation E=MC2 (sorry, no symbol) the energy is proportional to mass and if you want to travel faster than the speed of light you would need an infinite amount of energy and therefore and infinite mass which is not possible as the universe is not infinite however it may be possible to travel throught time in wormholes, we have cannot prove it but we cannot disprove it. Relativity does not just mean you can't travel in time, it just means you can't travel faster than the speed of light.

You can also slow down time by going faster. If you are on a train going at 60mph and an observer outside is merely walking time will be passing slower for the people in the train!

of course , its obvious

I mean look it takes less time for one to go from A to B if your going 60 mph

than someone who's walking

this is NO surprise

I mean come on

you don't need realivity to see this , surely

[neutralino]

of course , its obvious

I mean look it takes less time for one to go from A to B if your going 60 mph

than someone who's walking

this is NO surprise

I mean come on

you don't need realivity to see this , surely

But this isn't what relativity says. Relativity tells us that as an observer speeds up, his clock ticks at a slower rate. This is called 'time dilation,' and does not occur in a classical picture.

[dipayankar]

I hope people do not achieve immortality due to relativity...

But this isn't what relativity says. Relativity tells us that as an observer speeds up, his clock ticks at a slower rate. This is called 'time dilation,' and does not occur in a classical picture.

[Max™]

You're misunderstanding something.

It isn't just your clock ticking slower, you're moving more slowly through time, which means you're living slower as well.

Contrary to what Dave might insist, Relativity is not just about measurement.

My example of this, is suffocating.

At rest, it takes you roughly 3 minutes without oxygen before you simply stop living.

If you were accelerating near the speed of light and flew past an observer at rest, he would claim it took possibly thousands of years for you to suffocate.

You would still only observe 3 subjective minutes.

You're moving through time differently, because you're moving through space differently.

[neutralino]

You're misunderstanding something.

It isn't just your clock ticking slower, you're moving more slowly through time, which means you're living slower as well.

Of course, but then that would just be a type of biological clock. The phenomenon is clearly not something attributed to only mechanical clocks. I thought this was obvious when I called it 'time dilation.'

[dipayankar]

Max I agree with Neutralino... the biological clock and the physical (mechanical) clock might have drastically different values and properties..

Of course, but then that would just be a type of biological clock. The phenomenon is clearly not something attributed to only mechanical clocks. I thought this was obvious when I called it 'time dilation.'

[Max™]

Ok, take a physical process, such as the decay of free neutron.

This is not a biological process, it has it's limits written into it by the very structure of the universe.

At rest it takes 15 minutes.

At 99.9999999999% the speed of light, it will take 15 subjective minutes, but to an observer at rest, it will take millions of years.

[neutralino]

Max I agree with Neutralino... the biological clock and the physical (mechanical) clock might have drastically different values and properties..

I didn't say that!

Ok, take a physical process, such as the decay of free neutron.

This is not a biological process, it has it's limits written into it by the very structure of the universe.

At rest it takes 15 minutes.

At 99.9999999999% the speed of light, it will take 15 subjective minutes, but to an observer at rest, it will take millions of years.

Of course; I'm not arguing with you!

[Max™]

I was talking to Dipankyar actually, regarding his comment of immortality through relativity.

You could describe it as time travel into the future, but if you only have 100 some odd unaugmented years of life alotted to you, and you undergo a relativistic jaunt at some significant fraction of the speed of light, you will not experience those millions or billions of years you cross.