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,

Astronomy!

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