T-Tauri type
A T-Tauri type was a type of star. It was unusual for a T-Tauri star system to have a planet in the class M range. 

Small, extremely unstable wormholes are a phenomenon sometimes encountered near T-Tauri systems – in the century between 2267 and 2367, thirty-nine had been mapped.

In 2367, the  discovered a T-Tauri star system within the Ngame Nebula. The system had one planet, a terraformed class M world, home to the xenophobic Paxans. ()

See also 
 'etnap Nebula

External link
 

de:T-Tauri-Stern
Astronomical classifications
Celestial objects