A T-class gas giant in the Delta Quadrant

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. Captain Kathryn Janeway took the Flyer to a nearby class T gas giant with a ring system, 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. (VOY: "Good Shepherd")

According to the Star Trek: Star Charts, a class T planet is a gas giant classified as a "large ultragiant", 50,000,000 to 120,000,000 kilometers in diameter, with an age of two to ten billion years.

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