Hertzsprung Russel Diagram - a plot of the surface temperature (color) of stars vs. their luminosity (brightness), luminosity - the intensity or brightness of light from a celestial body, Milky Way galaxy - the galaxy in which Earth and Sun are located, nebulae - large cloud of gas and dust in interstellar space; the location of star formation, star - a celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior, universe - All of space and the matter space contains, Big Bang Theory - A theory that states the universe began from one point billions of years ago and has been expanding ever since., origin - the place or form from which something comes or is derived, scientific theories - unifying scientific explanations for a broad range of hypotheses and observations that have been supported by scientific experiments, galaxy - a large grouping of stars in space,

Components of the Universe

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