what are some of the things that you smash together in the universe

Question: what are some of the things that you smash together in the universe
- Keywords:
  collision,
  research,
  universe
Asked by khaknegarmoghaddam to Claire on 17 Jun 2013.
- Claire Lee answered on 17 Jun 2013:
  
  Protons! (Well, mostly protons, sometimes lead ions too).
  
  Here’s a more detailed explanation on a different thread:
  /speedj13-zone/2013/06/17/what-sort-of-things-do-you-collide/

Question: what are some of the things that you smash together in the universe