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, galaxy - a large grouping of stars in space, Elliptical Galaxy - a type of galaxy that has a rounded or flattened shape and no arm, White Dwarf - Star that is classified as hot and dim, Luminosity and temperature - two properties of a star represented on a HR diagram, Spiral Galaxy - a galaxy that have a bulge in the center and arms that spiral outward like pinwheels, Irregular Galaxy - A galaxy that have an overall spherical shape and no arms,

Components of the Universe 1

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