Infrared dark clouds
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| definition | A dark cloud characterized by a visual extinction A_v ≥ 10^2 mag. Infrared dark clouds are opaque even at 8 μm, and can be seen in silhouette against the bright diffuse mid-infrared emission in the interstellar medium. | |||||||||||
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| contributor | AAS_Frey.Katie_Admin original | |||||||||||