© Lloyd

 

Charles Chandler said:

The arms are whipper snappers plowing through plasma, and new stars are forming on the leading edge, where matter is compressed by the collisions. The trailing edge is shielded from all of this, and has only the old stars from when the filament first formed.

You haven't covered this type of star formation yet in the section on star formation, have you? If not, it would probably only need a few sentences added there.