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هى أجسام كبيرة الحجم مضيئة متوهجة تشع ضوءاُ وحرارة النجوم
هى أجسام اصغر حجما ً من النجوم معتمة لا تشع ضوء ً ولا حرارة بل تستمد ضوءها وحرارتها من النجوم . الكواكب
أجسام أصغر حجما ً من الكواكب ، معتمة لا تشع ضوء ً ولا حرارة . تدور حول الكواكب وترتبط بها بفعل الجاذبية الأقمار
هى تجمعات كبيرة من النجوم المختلفة الأحجام والأشكال والأنواع التى يفصل بينها مسافات كبيرة المجرات
هى مجموعة هائلة من أجسام غازية تظهر فى السماء على شكل سحابة من الغبار السُدم
أجسام صلبة كبيرة الحجم عند احتكاكها بالغلاف الجوى للأرض ترتفع درجة حرارتها وتحترق جزئيا النيازك
 أجسام صلبة صغيرة الحجم عند احتكاكها بالغلاف الجوى للأرض ترتفع درجة حرارتها وتحترق كليا الشهب
Created by: hatem osman
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