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Cycle of a star

Stellar Nebula a stellar Nebula is a massive star. Near the star’s center sweeps through a surrounding molecular cloud…Step:1
protostar an early stage in the evolution of a star, occurs AFTER the collapse of the gas cloud from which it is formed…In other words, after the gas cloud collapses, it forms the first stage of the star. Step:2
main sequence This is the step that once achieving nuclear fusion, the star slowly decreases over billions of years to repay for the heat and light energy lost…Step:3
supergiant a very large star of high quality and low surface temperature with no hydrogen left in it’s core…Step:4
supernova star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass...Step:5
Black Hole a region of space having a gravitational field so intense that no matter or radiation can escape…Step:6