I just found largest star maybe ever, vanilla game no mods version 0.9.8.0 also i didnt edited it, just randomly clicked at random star in random galaxy... Look at its diameter: Star RS 0-0-0-840-18123-0-0-26
Type: Red Supergiant
Spectrum: M5.7 Ib
Diameter: 94.3 AU (10135 D of Sol)
Mass: 300 Masses of Sol
Absolute magnitude: -7.99
I even have a picture, but i just registered bcs of this star and i dont know how to post a picture.