What are the stages of star development?

in other words can you list the stages of how a star develops starting from a nebula to its ending stage?pleas help?What are the stages of star development?Stellar evolution begins with the gravitational collapse of a giant molecular cloud (GMC). Typical GMCs are roughly 100 light-years (9.5×1014 km) across and contain up to 6,000,000 solar masses (1.2×1037 kg). As it collapses, a GMC breaks into smaller and smaller pieces. In each of these fragments, the collapsing gas releases gravitational potential energy as heat. As its temperature and pressure increase, a fragment condenses into a rotating sphere of superhot gas known as a protostar.



Protostars with masses less than roughly 0.08 M⊙ (1.6×1029 kg) never reach temperatures high enough for nuclear fusion of hydrogen to begin. These are known as brown dwarfs. Brown dwarfs heavier than 13 Jupiter masses (2.5 × 1028 kg) do fuse deuterium, and some astronomers prefer to call only these objects brown dwarfs, classifying anything larger than a planet but smaller than this a sub-stellar object. Both types, deuterium-burning or not, shine dimly and die away slowly, cooling gradually over hundreds of millions of years.



For a more massive protostar, the core temperature will eventually reach 10 megakelvins, initiating the proton-proton chain reaction and allowing hydrogen to fuse, first to deuterium and then to helium. In stars of slightly over 1 M⊙ (2.0×1030 kg), the CNO cycle contributes a considerable portion of the energy generation. The onset of nuclear fusion leads relatively quickly to a hydrostatic equilibrium in which energy released by the core exerts a "radiation pressure" balancing the weight of the star's matter, preventing further gravitational collapse. The star thus evolves rapidly to a stable state, beginning the main sequence phase of its evolution.



A new star will fall at a specific point on the main sequence of the Hertzsprung-Russell diagram, with the main sequence spectral type depending upon the mass of the star. Small, cool, low mass red dwarfs burn hydrogen slowly and will remain on the main sequence for hundreds of billions of years, while massive hot supergiants will leave the main sequence after just a few million years. A mid-sized star like the Sun will remain on the main sequence for about 10 billion years. The Sun is thought to be in the middle of its lifespan; thus, it is on the main sequence.



After a star has burned out its fuel supply, its remnants can take one of three forms, depending on the mass during its lifetime:



White dwarfs

Neutron stars

Black holesWhat are the stages of star development? A stars development starts as a nebula. Hydrogen, gas and dust create nebulas. All nebulas have a globule mass made of dense dark clouds. The globule grows when the gravitational pull strenghtens and eventually becomes an early star. There ways a star can die. first it can simply burn out of gases or it can happen by a supernova. A supernova is an exploding star. Supernovas contain at least thirty times more mass than the sun does. One kind of star is a pulsar. a pulsar is a fast spinning and espcially dense star that sends out radio pulse creating black holes! Now you have some information on stars, straight from the facts.