How to to find coordinates of the center of a triangle in a $3$-d environment if the $x, y, z$ vertexes are known?

Question

Data provided:

$x, y, z$ coordinates for 3 points in space (it's 3 stars in the solar system).

I have the stars coordinates from the Galactic coordinates system and basically I want to find the $x,y,z$ coordinates for the system at the center of aforementioned triangle.

In short is it possible to find the center of a triangle which is neither parallel to x or y or z plane?

Thanks in advance I apologize for my poor English and whoever will solve me this will make me real happy

Galactic coordinates where sol are $(0,0,0).

https://en.wikipedia.org/wiki/Galactic_coordinate_system