Imagine a big gas cloud. Overtime gravity will collapse it to a very dense gas cloud. When this happens the gas will become so dense that the atoms in it will smash together like in a nuclear explosion. This produces light – like we see in the Sun. All the light from stars comes from these nuclear explosions happening due to the smashing together of atoms in very dense gas.
Comments
Gajanan commented on :
How many stars out there and what are they called ?
HarSimpson commented on :
Very interesting. Nice question.