What is the primary characteristic of a Dark Nebula in visible light?
Answer
It is opaque and blocks the light from stars located behind it.
Dark nebulae are regions of dense molecular gas and dust that are so opaque they effectively hide or obscure whatever lies behind them, rendering them invisible against the black background of space unless they are silhouetted against a brighter source.
#Videos
Nebulae: Crash Course Astronomy #36 - YouTube
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