ellipse, the shape of a celestial body's orbit when it is not perfectly circular, circle, Has an eccentricity of 0, line, Has an eccentricity of 1, eccentricity, How "smushed" an orbit's shape is, Mars, terrestrial planet, Neptune, jovian planet, Kepler Law 2, celestial bodies orbit equal areas in equal amounts of time, Kepler Law 3, the further an object from the Sun, the longer it takes to orbit, Gravity, the force that causes things to move faster, Distance from Sun, the variable that controls a celestial body's speed, aphelion, far away from the Sun, perihelion, close to the Sun, quantitative, numbers!!!, star stage, can be determined from elements present in a star, velocity, speed with a direction

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