u guys learnt physics? i have a simple question but can't answer myself. my question is how come a twin brother traveling with speed of light has longer life time than the one living on the earth? sorry if i bother u in the new yr eve.

ok if you can answer this you'll know it...........






































































































got it............ well tell meh a child isborn in moon and a child is born in earth at the same time. tell meh who'll get old first.........



























































-rockend

Speed of light is unreachable for anything with mass greater than zero(according
to theory of relativity).
And for the answer about twins just ask google or wikipedia about
"twin paradox" you will find tons of answers.

HI, According to Einsteins relativity time is not absoulute physical quantity. Time also depends on velocity of frame of reference. When one of the twin travel in high speed space craft then the time in the spacecraft runs slow in comaprison to the people one earth ( rest frame) but for the twin in spacecraft the time is normal.So in this case there are two diffrent times.one spacecraft time and another earth time which is in rest(lets suppose) with respect to space craft.Now the twin who is in space craft is going to have his entropy change( his physcial change or mental as older or younger) according to the apacecraft time. So if he spent 5 years in space craft accoroding to space craft time then he will be older by 5 years but here in earth more than 5 years (depends on spacefraft speed) will have been elapsed for example 20 years. So if the twin returns to earth after 5 years of spacecraft time then he will find himself 15 years yonger than his twin who remained on earth. He has no idea that time on earth already elapsped by 15 years. IF the time diffrence is quite much then it can be felt physically( he will be indeed younger) or comapring earth time with the spapce craft time.

well, we know some people have traveled to space. do you guys think their age got increased?

sure but in millisecond or a little more

BUDRAY
you mean if velocity increases it decrease the time elapse. is it right?
i kinda have little confusion
jayamatadi

ye jaya, i think the time elapsed on traveler's watch is shorter than that on earth. What paradox said just before makes sense to me.

I think the speed of light has nothing to do with the life span of a person. So, the one travelling with the speed of life cannot have a longer life than the one living on the earth.

which came first???
Chicken or the Egg???.............this gets me thinkin...........

... OK here is my understanding

Gravity, that we know today, is the curvature of space and time caused by mass. There are many dimension of universe and "they" are working on finding more as we speak. Time and space curve near earth or sun (e.g. http://www.astronomynotes.com/evolutn/grwarp.gif). Curvature is sharp at sun compared to earth. Lets go little further to black hole where its mass is so concentrated that its gravitational "force" is intense i.e. theoretical infinite curvature of space and time. "Event horizon" the point where time stops in Black hole that not even light can escape. If you cross that point, theoretically, you age remain the same for infinite time there but in practical you will be sub-atomic particle before you even know. We are just starting to understand the nature of universe and there are few controversy already e.g. Hawkins paradox, dark matter, space acceleration, its ultimate fate and so on..

As we know, time is one of the dimensions in "astronomical" world. If there is no curvature in time, you travel at speed of light and your "age" remains the same where in earth it moves faster. There is still a debate out there regarding Einstein theory of relativity and human age in space. What about your cellular development. Does that depend on space 'clock'? If not then irrespective of human age difference everyone traveling in space or at earth looks same. Mr. X at earth at age 80 and Mr. Y at space "age 25" will look same.

dear ofline and budray,

For example RBC dies every 120 days. If the person travelling in the space at a speed of light has their RBC not dying at that rate? or they die at a rate more than 120, let's say every 2000 days? I am confused. DOes it relevant to the idea u have presented here. i need more illustration.

jayamatadi posed a very good question, really a good question.
we need to think how the 'twin paradox problem' can be related with RBC lifetime; we would be able to explain it, but almost impossible to challenge twin paradox theory. Maybe offline and paradox would give some good idea about this.
thanks guys