هو كتلة ضخمة من الغاز يغلبه الهيدروجين الذي يندمج نووياً تحت تأثير الضغط العالي ليُصدر ضوءاً وحرارة. تأتي النجوم بأحجامٍ مختلفة وتكوينات للعناصر تتغير مع مرور الزمن.
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