Gravity, A force of attraction between objects that is due to their masses., Weight, The effect of gravity on a mass, Orbit, a circular path around another object, Revolution, The movement of an object around another object, Year, the time required for the Earth to orbit once around the sun 365 1/4 days, Rotation, The spinning of Earth on its axis, Day, the time required for Earth to rotate once on its axis 24 hours, Axis, an imaginary line that runs straight through the planet from the North Pole to the South Pole, Daytime, The side of the Earth that has rotated toward the Sun., Night, The side of the Earth that has rotated away from the Sun., Astronomical Unit, the average distance between the Sun and the Earth; used to measure things inside our solar system, Light year, the distance light can travel in one year; used to measure very large distances outside of our solar system

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