Class T planet

In the Federation standard system of planetary classification a class T planet was used to categorize some types of gas giants.

In 2376, the Delta Flyer came in contact with a dark matter lifeform in a class T cluster and was disabled. Kathryn Janeway took the Flyer to a nearby class T gas giant with orbital rings, including one that was radiogenic, hoping to use those particles to reinitialize the Flyer's warp reaction. She eventually set off a chain reaction inside the rings with the Flyer's phasers to deter more dark matter lifeforms. 

Klasse T Tクラス Klasse T planeet