How are the most massive Dark Nebulae observable despite lacking visible light?
Answer
They radiate strongly in the radio and microwave portions of the spectrum due to cold molecules.
Dark nebulae are not luminous in visible light, but they are extremely important as they radiate strongly in the radio and microwave portions of the spectrum due to the presence of cold molecules, allowing observation via radio telescopes.
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Nebulae: Crash Course Astronomy #36 - YouTube
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