how many years will it be before the sun hits the earth?

Question: how many years will it be before the sun hits the earth?
- Keywords:
  earth,
  end of the world,
  sun
Asked by james-peters pokemaster to Sarah, Connor on 21 Jun 2015.
- Connor Macrae answered on 21 Jun 2015:
  
  Well it likely won’t ever hit the Earth as it is now. But in over 5 billion years the Sun will use up all it’s Hydrogen and Helium fuel then explode as a supernova – this will be an explosion that will likely engulf the whole solar system!

Question: how many years will it be before the sun hits the earth?