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A Super Star Cluster is a very large region of star formation thought to be the precursor of a globular cluster. They typically contain a very large number of young, massive stars that ionize a surrounding H II region, which is in turn surrounded by a cocoon of dust. In many cases, the stars and the H II regions will be invisible to optical observations thanks to high levels of extinction. As a result, the youngest SSCs are best observed in radio and infrared.

References:

Extragalactic Ultracompact HII Regions: Probing the Birth Environments of Super Star Clusters by Kelsey E. Johnson in May 2004 contains a review of what we know and don't know about SSCs

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	A '''Super Star Cluster''' is a very large region of [[star formation]] thought to be the precursor of a [[globular cluster]]. They typically contain a very large number of [[T Tauri Star\|young], [[OB star\|massive stars]] that ionize a surrounding [[H II region]], which is in turn surrounded by a cocoon of [[cosmic dust\|dust]]. In many cases, the stars and the H II regions will be invisible to optical observations thanks to high levels of [[extinction_(astronomy)\|extinction]]. As a result, the youngest SSCs are best observed in [[radio astronomy\|radio]] and [[infrared astronomy\|infrared]].		A '''Super Star Cluster''' is a very large region of [[star formation]] thought to be the precursor of a [[globular cluster]]. They typically contain a very large number of [[T Tauri Star\|young]], [[OB star\|massive stars]] that ionize a surrounding [[H II region]], which is in turn surrounded by a cocoon of [[cosmic dust\|dust]]. In many cases, the stars and the H II regions will be invisible to optical observations thanks to high levels of [[extinction_(astronomy)\|extinction]]. As a result, the youngest SSCs are best observed in [[radio astronomy\|radio]] and [[infrared astronomy\|infrared]].