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Earth, Moon,stars
science
Term | Definition |
---|---|
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 |