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Comment calculer une année–lumière.
La lumiére émise par Proxima du Centaure met 4.3 années pour atteindre la Terre. Prendre la calculatrice et faire le calcul.
la vitesse de la lumière: La distance entre le Soleil et la Terre est D=150millionsde km. Calculer le temps que met la lumière pour nous parvenir. 1.
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