Triple star system | Star system in universe

Triple star system Star system in universe
There are different types of star system do not confused with star system and planetary system star system have combination of two or more than two stars but planetary system have must be planet
Elgol system have been studied since 1670.
Planets are find by transit method in which incoming light from any star is studied when any planet passing between that star and Earth is changes.
Different type of telescope and spectroscopic telescope are used to find that a stars and planets in a space