Study of the moon, stars and other objects in space

the imaginary line that passes through Earth's center and the North and South poles

the spinning of Earth on its axis

the movement of one object around another

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

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

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

a push or a pull

a force that moves rocks and other materials downhill; the force that pulls objects toward each other

every object in universe always attracts other objects

the amount of matter in an object

the force of gravity on an object

the tendency of an object to resist a change in motion

the scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force

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