# relativity and the twins paradox

• September 1st, 2009, 01:13 PM
rgba
Hi there!

I've been reading Stephen Hawking's book, a brief history of time.

If one of two twins goes to live on top of a mountain, and the second twin goes to live at sea level, the first twin will age faster than the second. As far as I can understand this, the first twin will age faster because light reaches him first (the difference is so minuscle because the height of a mountain is so tiny relative to the speed of light). Is that correct?

I also read another version of the paradox, which states that if a twin (called A) gets into a spaceship and travels into space at close to the speed of light, while his twin (called B) stays on earth, that on the twin A's return to earth we will see that the twin B has aged considerably.

I'm confused, because I thought the longer it takes light to reach you, the faster time?

Or maybe I'm not getting the whole concept wrong? The speed of light is constant no matter how fast you are moving.

Hope someone can explain this a bit better!

Thanks, looking forward to a response!
• September 1st, 2009, 02:03 PM
Chronman
• September 1st, 2009, 02:17 PM
rgba
Wow thanks Chronman, that looks like a really neat article! :)