የብርሃን አመት ብርሃን በሰከንድ እስከ 300,000 ኪ.ሜ.
እየተጓዘ በአንድ አመት የሚጨርሰው ርቀት ነው። ብዙ ጊዜ ይህ ርቀት በጣም ትልቅ ከመሆኑ የተነሳ በጠፈር ውስጥ ያሉ ርቀቶችን ለመለካት እንጠቀምበታለን።
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