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Embedded cluster

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"Embedded stellar cluster" redirects here and is not to be confused with open cluster.
X-ray view of Orion showing the Trapezium embedded cluster.

Embedded clusters are stellar clusters that are still encased in its progenitor gas and are areas of active star formation. Due to the dense material that surrounds them, they are impervious to optical observation but reveal themselves in the infrared and X-ray spectra.

Several embedded stellar clusters are know to exist.

Trapezium cluster Rho_Ophiuchi_cloud_complex IRAS 22551+6621

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