السنة الضوئية وحدة قياس زمن أم مسافة؟

06 يوليو 2013

يخطأ البعض باستعمال المصطلح الفيزيائي "سنة ضوئية" كوحدة قياس للزمن وهذا مبرر باعتبار السنة وحدة زمن.

الا ان الحقيقة ان السنة ضوئية وحدة مسافة وليس العكس

السنة الضوئية (light year) وحدة قياس تستخدم للمسافات الكبيرة والبعيدة جداً كالمسافة بين الأرض والنجوم. وتعرف السنة الضوئية على أنها المسافة التي يقطعها الضوء في سنة واحدة. وتساوي 9.4605284 × 10 (^15) متراً/ سنة.

ويقدر العلماء حجم الكون بحدود ثلاثين ألف مليون سنة ضوئية.

معلومات علمية، معلومات ثقافية

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السنة الضوئية وحدة قياس زمن أم مسافة؟

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