term1 Definition1term2 Definition2term3 Definition3
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astronomy
a study of things in space
axis
an imaginary line that passes through Earth's center
calendar
a document of days, weeks, months, and years
equinox
the two days of the year on which neither hemisphere is pointed towards or away from the sun
force
a push or pull exerted onto an object
gravity
the attractive force between objects
inertia
the tendency of an object to resist a change in motion
law of universal gravitation
the scientific law that states that every object in the universe attracts every other object
mass
the amount of matter in an object
Newton's first law of motion
the scientific law that states that an object at rest will stay at rest and a object in motion will stay in motion unless acted upon by a force
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