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Earth,Moon,and Sun

PS Ch. 12.1

TermDefinition
Astronomy The study of the Moon, Stars, and other objects in space
Axis the imaginary line that passes through Earth’s center and the North and South Poles
Rotation the spinning of Earth on its axis
Revolution the movement of one object around another
Orbit a path
Solstice when the sun is farthest North or South of the equator
Equinox when the noon sun is directly above the equator (occurs twice a year)
Gravity Attracts all objects toward each other
Law of Universal Gravitation States that every object in the universe attracts every other object
Mass The amount of matter in an object
Weight The force of gravity on an object
Inertia The tendency of an object to resist a change in motion
Newton’s First Law of Motion 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 an unbalanced force
Created by: alondraharo
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