This is a science and a technology generally associated with civilizations of Tech Level 10 or higher. It is a civilizations ability to alter, modify, repair and build Suns (stars).
The most prominent Solar Engineers are the Wurgus who base their entire culture on this ability. No other known Civilization (including the Seenians and the Saresii) were known to engineer or work on and with Suns. A notable exception are the Narth, as their Star Narth-Light defies any Classification and is according to Wurgus the only star they do not understand.