If you travel quickly near the speed of light to the galaxy Andromeda , the nearest galaxy to us and away from us about 3 million light-years away , and back again to the earth at the same speed (ie,3 million light-years away again) , you will need to nearly 100 years at all. At the same time you will have passed nearly 6 million years on the ground !
One light-year is the distance light travels in a year, his speed - which represents the maximum speed can be accessed in the universe: 300 thousand kilometers per second. , Time is relative, and it changes with the speed at which it is moving. Whenever moved faster, whenever your watch sounded at a slower speed. Physical equations say that the effect of time dilation that appears only in the speeds near the speed of light and not in the speed in which we live daily (train, etc.).
If you do some mathematical calculations, you'll find that if we drove about 99.99999999% of the speed of light (since it is virtually impossible to reach 100% of the speed of light), will travel the six million light-years away in 100 years only for your watch, will increase your age by 100 years only, while have over 6 million full year on the inhabitants of the earth. Of course it almost impossible to move with such speed, and now with existing technology does not allow this, but this is theoretically possible, has been conducting tests with the time dilation of these particles in the laboratory.
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