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Earth, Sun, and Moon

Astronomy the study of the moon, starts, and other objects in space.
axis an imaginary line that passes through Earth’s center and the North and South poles, abour 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 toward 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's.
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 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 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 darkest part of a shadow.
Penumbra the part of a shadow surrounding the darkest part.
Lunar Eclipse blocking of sunlight to the moon that occurs when Earth is directly between the moon and the sun.
Created by: lopez.ash