The incredible journey of light from the core taking millions of years

Light consists of photons.Photons are the elementary particles basically the light itself.
   The Sun consumes 4 million tons of hydrogen per second. This loss of mass is converted into energy, 564 million tons of hydrogen are converted into 560 million tons of helium. The Sun produces its energy through nuclear fusion, due to the pressure and temperature prevailing in his big heart. This pressure and this temperature forcing electrons to break away and travel atoms released from atomic nuclei. Therefore the material no longer behaves like a gas but as a plasma. The nuclei of hydrogen powered against each other by the enormous pressure, will be transformed into helium nuclei. This fusion process generates a core mass slightly smaller and this difference is released as energy.  
  
The energy produced by nuclear fusion is conveyed from the heart of the Sun by light particles and heat, called photons. When merging two protons in a nucleus of deuterium to create a helium nucleus, photons are released. This particle, created in the solar core, transmits the light beam to Earth. To send us this photon must traverse the various layers of the Sun. The transit time of a photon of the heart at the surface is between 10 000 and 170 000 years based on collisions.

 Due to this photons are created they in the start they are the dangerous gamma rays which destroy the D.N.A of  living organisms. 

this deadly gamma ray turns into a less dangerous x-rays when the pass through the radiative zone, this process takes  millions of years.

 after that they are carried by the atoms and get transferred frequently from one atom to another, slowly losing energy and becoming visible light. This proscess happens in the convective zone. 

 Then the final atoms which carry the photons help the photos reach the surface . After they reach the surface

the photos are ejected from the  atoms, then the cold atoms literally fall back to carry more photons.

photons represented in the form of wave

 Then the photos or the light to be more precise attain the 3*10^8 m/s speed and take 8 mins to reach earth.

the sun's surface

Note : Light travels both as a electromagnetic wave and as a particle(photon). To know more on the dual nature of light visit: wikipedia.

  

Know more on photons on wikipedia