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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.
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 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 attracts the body toward the center of Earth.
law of universal gravitation The scientific law that states that every object in the universe attracts every object.
mass A typical large body of matter with no definite shape.
weight The mass or quantity of matter contained by it giving it downward force.
inertia The tendency of an object to resist any change in its object.
Newton’s First Law of Motion The scientific law that states that an object 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.
Phase One of the different apparent shapes of the moon as seen from space.
Eclipse The partial or the total blocking of one object in space or 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 the shadow.
Penumbra The part of the 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: VFerrer