Molecular clouds appear more transparent at longer wavelengths.

Name: Molecular clouds appear more transparent at longer wavelengths.
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Quizplus · Accepted Answer

This is because longer wavelengths can penetrate more dust and gas in the cloud, allowing us to see deeper into the cloud. Shorter wavelengths, such as visible light, tend to be scattered and absorbed by dust and gas particles, making molecular clouds appear more opaque.

Molecular Clouds Appear More Transparent at Longer Wavelengths