when is the next collision?

Question: when is the next collision?
- Keywords:
  collision,
  future,
  space
Asked by to Nate on 13 Jun 2014. This question was also asked by .
- Nate Bastian answered on 13 Jun 2014:
  
  If you mean on galaxy scales, our Galaxy (the Milky Way) will collide with our nearest massive galactic neighbour (the Andromeda galaxy) in a few billion years. The collision will result in us combining with Andromeda, to form a massive elliptical galaxy.
  
  If you mean stars, stars rarely collide. The reason is that the distance between the stars is so much greater than the size of the stars themselves. So it is only in the very centres of dense stellar clusters where collisions are likely to happen. But that tends to be very unpredictable so we don’t know when the next collision will happen in a globular cluster, but not likely within the next few million years.

Question: when is the next collision?