people have said that there are loads of planets out there, how many havent been explored?

Question: people have said that there are loads of planets out there, how many havent been explored?
- Keywords:
  explored,
  planet,
  space
Asked by elsta13lol to Helen, Jenni, Mark, Martin, Stu on 14 Jun 2011.
- Helen O'Connor answered on 14 Jun 2011:
  
  I would like to say millions of planets are unexplored – I like the idea that the universe is almost infinite. I dont know how large the universe really is thought, but other types of scientists in the other zones probably do!
- Jenni Tilley answered on 14 Jun 2011:
  
  More than anyone can imagine!
  
  Check this out to see how much of the visible universe we’ve actually mapped:
  http://www.theeternaluniverse.com/2010/01/how-much-of-observable-universe-have-we.html
  
  However it’s even more complicated than that as that’s only the parts of the universe we can observe. There’s even more universe we can’t see because it’s composed of dark matter – material that is undetectable by current methods. We know it’s there, we just can’t detect it.
  
  Or can we?! http://www.guardian.co.uk/science/2009/dec/17/dark-matter-detected

Question: people have said that there are loads of planets out there, how many havent been explored?