Epsilon 119

Epsilon 119 was a star.

All nuclear fission in Epsilon 119 had stopped by the 24th century and the star was considered dead. In 2370, Gideon Seyetik and the crews of Deep Space 9 and the USS Prometheus (NCC-71201) planned to ignite protomatter on Epsilon 119, with the hope that the protomatter cascade effect would transform carbon and oxygen into elemental hydrogen and restart Epsilon 119's nuclear fission. Seyetik later piloted a shuttlepod carrying the protomatter, killing himself in the crash, but successfully reigniting Epsilon 119. Benjamin Sisko noted that Epsilon 119's rebirth was a fitting tribute to Seyetik and his brilliance. 

In 2376, a hologram of Kurt Mandl told a hologram of Seyetik that reigniting Epsilon 119 took a lot of ambition.