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كم تساوي السنه الضوئية؟

Keep going السنة الضوئية 12 ديسمبر 2012

كم تساوي السنه الضوئية؟ السنة الضوئية مقياس فلكي للمسافات الهائلة بين الأجرام السماوية وتُعرف السنة الضوئية بمقدار المسافة التي...

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