هي سحابات بين نجمية يجتمع فيها الكثير من الغبار الكوني. تسمح كثافة الهيدروجين وقوة الضغط في بعض السدم بتكون النجوم.
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هي سحابات بين نجمية يجتمع فيها الكثير من الغبار الكوني. تسمح كثافة الهيدروجين وقوة الضغط في بعض السدم بتكون النجوم.