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px horsehead hubble

»»»Dark Nebulae

The Horsehead Nebula

"Dark nebulae" are similar to diffuse nebulae, but they are not seen by their emitted or reflected light.

Instead, they are seen as dark clouds in front of more distant stars or in front of emission nebulae.

Although these nebulae appear different at optical wavelengths, they all appear to be bright sources of emission at infrared wavelengths.

This emission comes primarily from the dust within the nebulae.

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