Twin Paradox: one twin is years older than the other


The twin paradox is about twins born on the same day but after a space voyage have a considerable age difference (in years). I am talking about a thought experiment in special relativity theory by Albert Einstein (huh? Special ? Is there also a not-so-special relativity? ) One twin stays home on earth, the other takes off in a space craft flying at approximately the speed of light. After 10 years, the space traveler returns to earth to find his twin has grown very old! Strange? I find it even stranger that if you travel with the speed of light you don’t crash into anything and return safely home. Well, many things are possible in thought experiments…..

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