Big Bang Theory - The prevailing cosmological model for the rapid expansion of the universe, cosmic microwave background - Microwave radiation that permeates the universe and is a remnant of the Big Bang itself., element - Chemical substance consisting only of atoms with the same number of protons, HR Diagram - Scatter plot in which the luminosity of the stars are plotted against their temperature, main sequence star - Stars that appears in the band that runs from top left to bottom right., nucleosynthesis - The production of heavy elements from the nuclear fusion of lighter ones , nebula - A large interstellar cloud of dust and gas., red shift - A phenomonon in which the light waves from a galaxy moving away from the observer are stretched., star - A giant luminous sphere of plasma undergoing nuclear fusion held together by its own gravity., Sun - The star in the center of our solar system,

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