star - a large celestial body that is composed of gas and that emits light; the sun is a typical star, light-year - the distance that light travels in one year; about 9.5 trillion kilometers, red giant - a large, reddish star late in its life cycle, white dwarf - a small, hot, dim star that is the leftover center of an old star, supernova - a gigantic explosion in which a mas-Sive star collapses and throws its outer layers into space; plural supernovae, black hole - an object so massive and dense that not even light can escape its gravity,

chapter 20

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