Since protostars are often deeply shrouded by dust, through which type of radiation are they typically observed by astronomers?

Answer

Infrared radiation

The thick cocoon of dust traps the visible light generated by the core's heat. This heat is efficiently radiated away at longer wavelengths, specifically infrared radiation, allowing observation.

Since protostars are often deeply shrouded by dust, through which type of radiation are they typically observed by astronomers?
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