Начало » секунда
През последните 50 години продължителността на секундата се дефинираше по един и същи начин. Но изследователи от Германия смятат, че са открили как да създадат най-точния часовник в света, който да показва с такава точност времето, че ако бъде превъртян с 14 млрд. години назад до времето на Големия взрив, ще загуби едва 100 секунди, […]
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