How dose the sun become a big ball of fire

Question: How dose the sun become a big ball of fire
- Keywords:
  energy,
  galaxy,
  space
Asked by Minecraft lover to Kerry, Ali on 10 Nov 2014.
- Alison Thomson answered on 10 Nov 2014:
  
  The sun is basically a giant ball of hydrogen atoms being squished together to form helium – this is called ‘fusion’.
  The reaction lets off a lot of energy in the form of light and heat – which is why it looks like a giant ball of fire!

Question: How dose the sun become a big ball of fire