an imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates

the spinning motion of a planet on its axis

the movement of an object around another object

the path of an object as it revolves around another object in space

either of the two days of the year on which the sun reaches its greatest distance north or south of the equator

either of the two days of the year on which neither hemisphere is tilted toward or away from the sun

the attractive force between objects; the force that moves objects downhill

states that every object in the universe attracts every other object

the tendency of an object to resist a change in motion

a testable idea you make based on information you already know

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