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Section 2 Characteristics of stars By Antonia James, Hannah Rohrborn, Jada Staples Characteristics used to classify stars include color, temperature ,size, composition, and brightness • A stars absolute brightness is if it was the standard distance from the earth. temperature is based on the color of the star • Blue or blue white is the hottest and red is the coolest The brightness of a star depends upon both its size and atmosphere. It depends on the size of the star and the stars temperature . Astronomers use a unit called the light-year to measure between the stars. • The distance of a light year is 9.5 million million kilometers remember that a light year is a unit of distance not time Astronomers often use parallax to measure distance to a nearby stars. The apparent movement when seen from a different position of a star The End