Explain the steps of the life cycle of a star. beginning with a nebula and ending with old age/death of a star, explain each step in a star’s life cycle

Gas Clouds (of Hydrogen), starts contracting under the influence of gravitational pull of gas.

As it's contracting, it's pressure & temperature increases, it is called "Protostar" now.

When Temperature become sufficiently high (4 million C), Nuclear fusion starts, & large amount of energy releases.

Energy Travels to star's surface and is radiated in the form of light, heat & EM Radiation.

The contraction of star stops only when "Inward Gravitational pull" is balanced by "Outward Radiant Energy". At this time, star becomes stable in size & temperature.

Contraction continues, 'causes star's outer region to 'boil' & 'expand'. At this stage, it becomes brightest, red giant.

As fuel burns, helium nuclei fuses & form Carbon nuclei further to silicon & further to Iron Nuclei by progressive Nuclear Fusions. At all this stages, star was very unstable.

Star end it's life in many different way & it depends on it's mass, whether it ends as "White Dwarf", "Neutron Star" or "Supernova"

This was a short note on life story of star. Hope this helps!

The correct answer is c. hope this