This piece is mistitled. It should read 'Massive Star Cluster Collision'. Massive stars are not colliding, contrary to what the title implies. In fact, it is *very* highly unlikely that *any* of the stars involved in this collision will themselves collide.
This kind of sloppy, haphazard reporting is on the rise. Don't take part by merely parroting their headline mistakes. NG isn't as bad as some (Engadget, Space.com and SciAm are among the worst). Best to read the article first then title appropriately.