How long is it before the sun engulfs our planet?

Question: How long is it before the sun engulfs our planet?
- Keywords:
  earth,
  end of the world,
  sun
Asked by EvilPossum123 to Andrea, Charlie 🚀, Col Op, Kirsty on 22 Jun 2016.
- Columbus Operations answered on 22 Jun 2016:
  
  Joao: In about 5 billion years the sun will begin to expand engulfing Mercury, Venus and, very likely the Earth. But don’t worry it’s not happening any time soon
- Andrea Boyd answered on 22 Jun 2016:
  
  What Joao said 🙂

Question: How long is it before the sun engulfs our planet?