What is a Cell ?

          Every living organism in our universe till date starts with a cell. The cell is the building block of every living organism. This cell contains a nucleus at the center of it. It Consumes food source around it and grows, divides and gets multiplied day by day. This is how life evolved on our planet earth with the use of oxygen as life evolving gas. There may be a chance of life to evolve in our strange vast universe with any other conditions where these living species may use some kind of gas like oxygen to survive and evolve and grow day by day. These living species may start not just like a single cell but as multiple cells which are evolved in different places at that place. These living may have different body design, abilities which are unlike the species which live on earth. But there is very highly less possibility of occurrence to evolve living organisms in this pattern.     

What is a Photon ?

          Every subatomic particle in our universe has which is combined with energy but the energy is released when the particle reaches a higher energy state when compared to its lower state. Photons are not actually particles but they are the energy which is released the electrons when an electron gains energy and jumps to a higher state. In our Universe, There is only one phenomenon which is called light. This is in the form of a Beam. A light ray is a collection of Photons. These are produced from the elements which are used in the production of a light ray. In elements, when reactions are produced within the subatomic particles of that atom, the electrons jump from lower energy level states to higher energy level states within the atom. Due to the shifting of electrons between the energy levels of the atom, The electron jumps from a higher energy level to lower energy level states, energy in the form of photons released in that region which is also called as photo energy. This photo energy when combined with the hypothetically invisible mass which forms into a light ray combined with the heat energy which is visible to the naked eye. Even the stars in our universe release the light in this same process due to the dust and gases which are present in it.