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Earth, Moon,stars


phases 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 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 the moon
tide the periodic rise and fall of the level of water in the ocean
spring tide the tide with the greatest difference between consecutive low and high tides
neap tide the tide with the least difference between consecutive low and high tides
telescope a device built to observe distant objects by making them appear closer
maria dark, flat areas on the moon's surface formed from huge ancient lava flows
craters a large round pit caused by the impact of a meteroid
meteoroids a chunk of rock or dust in space
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
revolution the movement of an object around another object
orbit the path of an object as it revolves around another object in space
calendar a system of organizing time that defines the beginning, length, and divisions of a year
solstice the two days of the year an which the sun reaches its greatest distance north or south the equator
equinox the two days of the year on which neither hemisphere is tilted toward or away from the sun
force a push or pull exerted on an object
gravity the attractive force between objects (strength depends on their masses and the distance between them)
law of universal gravitation 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 an object in motion will stay in motion and an object at rest will stay at rest unless stopped
Created by: hballard