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Earth, Moon, and Sun

TermDefinition
Astronomy The study of the moon, stars, and other objects in space
Axis An imaginary line that passes through Earth’s center and the North and South poles, about which Earth rotates
Rotation The spinning motion of a planet on its axis
Revolution The movement of an object around another object
Orbit The path of an object as it revolves around another object in space
Solstice The two days of the year on which the sun reaches its greatest distance north or south of the equator
Equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun
Gravity The force that pulls objects towards each other
Law of Universal Gravitation The scientific law that states that every object in the universe attracts every other object
Mass A measure of how much matter is in an object
Weight A measure of the force of gravity on an object
Inertia The tendency of an object to resist any change in its motion
Newton’s First Law of 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 an unbalanced force acts upon it
Phase One of the different apparate shapes of the moon as seen from Earth
Eclipse The partial or total blocking of one object in space by another
Solar Eclipse The blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth
Umbra The darkest part of a shadow
Penumbra The part of a shadow surrounding the darkest part
Lunar Eclipse The blocking of sunlight to the moon that occurs when earth is directly between the sun and moon
Created by: Alyssa Prado
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