Embedded cluster
Appearance
[[File::Chandra_X-ray_View_of_Orion.jpg The star cluster NGC 3572 and its dramatic surroundings.jpg|thumb|300px| 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.
Several embedded stellar clusters are know to exist.