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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, 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
moon a natural satellite that revolves around a planet
phase one of the different apparent shapes of the moon as seen from Earth
gravity a force that moves rocks and other materials downhill: the force that pulls objects toward each other
Created by: 084637