brightness - has two characteristics (luminosity and magnitude), redder - cooler stars tend to be __________, kelvin's scale - scale used to measure the star's temperature, solar mass - referred as the mass of the sun, star - a massive ball of plasma, radius - astronomers measure the size of a given star in terms of our own sun's ________., bluer - hotter stars have a _______ appearance, spectograph - a device that breaks light into colors and produces an image of the resulting spectrum, sun - the solitary star in our solar system, five - A star has ______ characteristics,

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