Time+Dilation-+Porath


 * __Time Dilation by Allyson Porath__**

Formula: 1'=1*sqr(1-v^2/c^2)

Time moves at different rates in different places. "[...] if the speed of light is constant, time cannot be constant [...]" ([|www.thebigview.com/]). Thanks to Eintstein, Special Relativity tells us that time is measured depending on the relative velocity of t reference frames it is measure in.

Time can be stretched and it occurs slightly at everyday speeds or when we reach a speed approaching c (speed of light). For measuring time of a light clock, the lgiht bounces up and down through a tube with parallel mirrors on each end (notes).

The brothers are thirteen years old and one goes off into space while the other stays at home. The space boy is going at 99% of the speed of light and is in space for a year exactly. When the boy comes back he is celebrating his thirty-first birthday, while his brother is celebrating his thirty-seventh birthday. So "time is stretched by facor of 7 at approx. 99% of the speed of light, which means that in the space traveller's reference frame, one year is equivalent to seven years on earth" ([|www.thebigview.com/]).
 * Twin Brothers**