Life cycle of a star!

This is a stars life cycle. Kinda just like a human life cycle. Actually, just life a human life cycle!

         When a Protostar is formed, that is the very first step of a star.  A protostar is a large mass that forms by contraction out of gas of a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in the process of a stars formation.

 

Protostar 

        Once achieving nuclear fusion, stars radiate (shine) energy into space. The star slowly contracts over billions of years to compensate for the heat and light energy lost. As this slow contraction continues, the star’s temperature, density, and pressure at the core continue to increase. The temperature at the center of the star slowly rises over time because the star radiates away energy, but it is also slowly contracting. This battle between gravity pulling in and gas pressure pushing out will go on over the entire life span of the stars.

Nuclear Fusion In Protostars

       Next, the Red Giant, also known as a Super giant. A red giant is a luminous giant star of low or intermediate mass (roughly 0.3-8 solar masses) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous , making the radius immense and the surface temperature low, from 5,000 K and lower. The appearance of the red giant is from yellow-orange to red, including the spectral types K and M, but also class S stars and most carbon stars.

Red Giant

 

Black holes are thought to form from stars or other massive objects if and when they collapse from their own gravity to form an object whose density is infinite: in other words, a singularity. During most of a star's lifetime, nuclear fusion in the core generates electromagnetic radiation, including photons, the particles of light. This radiation exerts an outward pressure that exactly balances the inward pull of gravity caused by the star's mass.

Black Hole / Star Eater

     As the nuclear fuel is exhausted, the outward forces of radiation diminish, allowing the gravitation to compress the star inward. The contraction of the core causes its temperature to rise and allows remaining nuclear material to be used as fuel. The star is saved from further collapse -- but only for a while.

White Dwarf

       Eventually, all possible nuclear fuel is used up and the core collapses. How far it collapses, into what kind of object, and at what rate, is determined by the star's final mass and the remaining outward pressure that the burnt-up nuclear residue (largely iron) can muster. If the star is sufficiently massive or compressible, it may collapse to a black hole. If it is less massive or made of stiffer material, its fate is different: it may become a white dwarf or a neutron star.

Neutron Star

Ahh!!! It's my first blog! This is for my fourth hour science class! :D