وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.

اشترك الآن

تمت عملية الاشتراك بنجاح

إغلاق

عذراً، عذرا،أنت مشترك مسبقاً بالنشرة البريدية

إغلاق

عذراً، هناك مشكلة في البريد الالكتروني

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فضاء وفلك

سديم انبعاثي |  Emission Nebula

18 يوليو 2019


هي سحابات مليئة بغاز تم تأيينه (خسر إلكترون) من قبل الأشعة فوق البنفسجية القادمة من النجوم حولها، فتطلق هذه السدم فوتونات في الطول الموجي المرئي ومن هنا أُطلق عليها سدم انبعاثية. تتراوح كتلة هذه السدم بين 100 إلى 100,000 ضعف كتلة الشمس.