what do you think that the universe is expanding into when it is growing?

Question: what do you think that the universe is expanding into when it is growing?
- Keywords:
  expansion,
  space,
  universe
Asked by izzylutkins to Duncan, Grant, Julie, Nik, Rachel on 19 Mar 2013.
- Nik Watson answered on 19 Mar 2013:
  
  I think we have to consider the notion of nothingness, when the universe expands theres just less nothingness. Not that we know how much nothingis left becuse its nothing.
  
  Hope that helps

Question: what do you think that the universe is expanding into when it is growing?