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, galaxy - a large grouping of stars in space, Spiral Galaxy, Elliptical Galaxy, Irregular Galaxy, Magnitude - Another word for luminosity or brightness, White Dwarf - Stars at the end of their life - very hot, not bright, Main Sequence - largest category of stars - contains stable stars, Sun (Sol) - The star in our solar system. Average sized yellow star, Electromagnetic Spectrum - Energy waves that are able to travel through space,

Components of the Universe

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