A set of twins. One boards a space ship traveling near the speed of light. He returns to earth and finds his twin brother has aged more than he. Time dialation, got it.
It takes light from a star 4 billion light years away 4 billion years to reach earth, thus we are looking back into time the way the star was 4 billion years ago. But are we really? Does light from stars go through time dialation? Does the star 4 billion light years away really appear to us the way it looked 4 billion years ago? Or is it more like 2 billion years ago? Is the star aging slower because it, or the light from it, is traveling so fast? I assume, given the fact that stars/galaxies experience redshift, that they are moving at a speed comparable to the speed of light and are thus subject to extreme cases of time dialation like those expressed in the twin paradox.
Could this too then mean that every other star could essentially appear to live longer than our Sun because they're traveling so fast?
2006-09-18
07:35:21
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6 answers
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asked by
Victor O
2