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Earth, Moon,stars


eclipse the partial or total blocking of one object in space by another
umbra the darkest part of a shadow
penumbra the part of a shadow surrounding the darkest part
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
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