Strange.

Why do you compare speed of life with age?

"lets say u have a twin brother, and he stayed behind on earth while u go traveling near the speed of light. when u return lets say 10 years later earth time, he would've aged 10 years (obviously), but u would have aged perhaps only 5 years (depending on how close u were to the speed of light)."

i dont understand this statement. Let say If i travel the speed of light. It only take me to certain place(A) much faster that the light. But the time I travel to A will determine my age, not the speed of light.

For example: If i travel to sun in 1 minute. Earth can only see after 3-4 minutes. By that time, I'm already back to Earth. What earth saw was my past (2 minute ago) but present I'm still 3minute older (when earth see me).

Am I right or wrong?

I still dont understant this statement:

1. theory of relativity state that the closer you are to speed of light, the slower your "time" is relatively. IE. if you travel for 10 minutes at speed close to c, then stop, 10 minutes of your time has passed. however, 10 years may have passed for someone at a slower speed.

You mean like this example?

If you got in a rocket ship and accelerated you could go what seems infinitely fast to you. You could travel to a star 100 light years away and get they by lunch, turn around, and get back to Earth the same day. But you will find that everyone else is 200 years (and one day) older than you are. From their perspective, you were traveling very close to the speed of light and it take 200 years for light to get to that star and back. But to you, it was only a day. Your aging slowed down because you move forward through time faster. What you observe as linear acceleration in space that obeys Newton's laws, isn't what really happens. You start out accelerating in space but as you gain speed you start accelerating through time instead. You can only move at the speed of light in space, but can move infinitely fast through time.

Remember the phrase "Never say never".

Who sez you can never travel at the speed of light or even faster than that? There are still many scientific unknowns in this universe that will (hopefully) be uncovered in the future.

True that at the moment you can't travel at the speed of light because based on CURRENT scientific knowledge, you'll be squashed at the back of your nice spaceship wall if you go "lightspeed" in an instant. However, that's based on CURRENT scientific knowledge. What if somebody uncovered a way to warp space, fold space, enter subspace, enter wormhole, abolish inertia or what not, where mass would not be a factor? Never say never.

The world was once believed to be squared (where if you travel far enough, you'll drop off the face of the earth!) but finally realized to be rounded.
The world was once the centre of the galaxy where everything revolves around it until somebody proved otherwise.
Humans never thought they could fly until the Wright brothers did it.
Newton & Einstein (to name a few) discovered many remarkable things that humans thought not possible.

The sky is the limit. Just that to travel at the speed of light won't probably be in my in lifetime.... 

Note : Yeah, I see too much movies, read too much sci-fi books and play too many games...... 

[?] ??

1. Going from zero to lightspeed is not acceleration? Then what is it called? Velocity?

2. Lightspeed just mean 300k km/s. Does it mean that you can only call it lightspeed if you use conventional rockets and not some other way? If somebody can travel more than 300k km/s using some other method, it is not breaking the lightspeed barrier? Or is lightspeed barrier just solely reserved for the theory of relativity?

3) Yes, current scientific laws and theories puts a boundary at light speed. I guess it also includes current rocket technology and not "never know the future" propulsion technology. If that is the case, why discuss about the speed of light when a rocket can only go a fraction of the speed of light? If you want to say "IF you can travel at near the speed of light", that is about the future, no? Based on current technology, it is an impossible "if".

What I'm saying is, there are probably some unknown theories in the future that either improve or disprove this theory, enabling a work around to the lightspeed barrier.

Better get back to my sci-fi games.......

[exit forum]

We'll turn into spaghetti when we travel with speed of light

Its bcause if we r able to move with speed of light thats c=299 792 458 m/s , we cant make every cell in our body to move with that speed constantly,some cell may b moving with the speed of 299 792 458m/s,some with 299 792 390m/s  ,or some with 299 792 592 m/s .

These 3 speeds hv a small difference.And this small differences can cause ur body to tear into parts and some into mee-liked meat and some like loushufen-liked meat.

Think properly,and u'll find it true

And so,human cant move with speed of light bcoz we'll be dead even b4 we reach that speed due to the theory i stated there ,G-forces and other reasons.