newbie question: rendering galaxy map in 5.1

I am an Unreal newbie, veteran C++ programmer.

I am porting an older game I have been working on from a custom engine to Unreal. I have a spiral galaxy map in 3D. In the good old days I used GL\_POINT to plot the stars. I have the following requirements:

* support large world coordinates. * display the points in different colors (I use this for different spectral types) * detect mouse-over so that I can display data on the star system under the cursor

I have read that I can programmatically place Niagara particles. Can I set the color? Detect mouseover?

Is there a better way? I would appreciate any suggestions.

I am using blueprints and C++.