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…..
Twin Paradox: one twin is years older than the other