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Chapter 1

Earth, Moon, and Sun

astronomy the study the moon, stars, and other objects in space
axis the imaginary line that passed through Earth's center and the north and south poles
rotation the spinning of earth on its axis
revolution movement of one object around another
orbit a path of an object takes as it revolves around another object
calander a system of organizing time that defines the beginning length and divisions of a year
solstice when the sin is farthest north or south of the equater
equinox when the noon sun is directly overhead at the equator, happens 2 a year
force a push or pull
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 says that an object at rest will stay at rest and a object in motion will stay in motion
phases the different shapes of the moon you see from earth
eclipse when an object in space comes between the sun and a third object it casts a shadow on the object
solar eclipse when a new moon blocks your view of the sun
umbra the very darkest part of the moon's shadow
penumbra the moon casts a part of its shadow that is less then the umbra
lunar eclipse occurs at a full moon when the Earth is directly between the moon and the sun
tide the rise and fall of ocean water that occurs every 12.5 hours or so
spring tide combined forces produce a tide with the greatest difference between consecutive low and high tides
neap tide the sun's pull is at right angles to the moon's pull
telescope a device built to observe distant objects by making them appear closer
maria the moon's surface's dark flat areas
craters large round pits on the moon's surface
meteoroids chunks of rock or dust from space
Created by: mjbernhardt3