Trialan sun

From Memory Alpha, the free Star Trek reference.

The Trialan sun is the star of the Trialus system, a star system in the Gamma Quadrant.

While in orbit of the planet Meridian, the USS Defiant launched a probe into the sun's corona. Probe telemetry revealed that the fusion reactants in the sun's core were out of balance, creating a cascade reaction which caused Meridian to shift between dimensions. (DS9: "Meridian")