The Black Cluster was formed from collapsed protostars 9 billion years ago, and is one of the most ancient formations in the galaxy, as well as being a huge gravitational obstacle.
	Starbase 514 is nearby the Black Cluster, and lost contact with the science ship S.S. Vico.
	First mention of the Breen (as featured in spinoff series Deep Space Nine). They have been known to attack ships randomly, and have outposts near the Black Cluster. They wear helmets.
	The Dokarran culture was known for its harmony and had a temple called Kural Hanesh. Their culture is taught to the primary school children onboard the Enterprise.
	Computer link up signals are unable to penetrate emergency bulkheads.
	Cloaking field are difficult to maintain in a gravitationally unstable area.
	Disruptors, warp fields, sensors and phasers go "all over the place" in gravitationally unstable areas.
	Computer posts on starships are only operable by specific crewmembers.
	Tamarin Frost is a soft drink.
	Elamos the Magnificent of Tagas is a mythological figure.
	When Geordi was 5, he was caught in a fire for a couple of minutes before his parents rescued him.

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