How big is the smallest star? – Extreme Size Zone

Question: How big is the smallest star?
- Keywords:
  space,
  star,
  universe
Asked by gunna to Nick, Alan, Deepak, Francesca, Lilly on 13 Mar 2014. This question was also asked by siobhanfahyx.
- Nick Wright answered on 13 Mar 2014:
  
  That’s a really good question! When stars get really small they find it hard to burn hydrogen in their cores and we call these stars “brown dwarfs”. These stars are about 1/10th the size of our Sun (still much bigger than the Earth). We don’t yet know how to distinguish the smallest stars like brown dwarfs and the largest planets – in many ways they are very similar!
- Alan Fitzsimmons answered on 14 Mar 2014:
  
  Yep, to put it into place, these are small brown dwarf stars that are only about the size of the planet Jupiter. But their surfaces are still at a temperature of about 1000 degrees or more!
- Francesca Day answered on 18 Mar 2014:
  
  I guess the smallest star would be neutron star. These are left over after a larger star dies and collapses. They have a diameter of about 6 miles!

Question: How big is the smallest star?