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28 Cards in this Set
- Front
- Back
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astronomy
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the study of moons, stars and other objects in space
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axis
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an imaginary line that passes through earth's center and the north and south poles
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rotation
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the spinning motion of a planet on its axis
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revolution
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the movement of an object around another object
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orbit
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the path of an object as it revolves around another object in space
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calendar
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a system of organizing time that defines the beginning, length and divisions of a year
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solstice
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two days of the year on which the sun reaches its greatest distance north or south of the equator
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equinox
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the two days of the year on which neither hemisphere is tilted towards or away from the sun
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force
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push or pull
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gravity
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the force that pulls objects towards each other
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universal law of gravitation
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the scientific law that states that every object in the universe attracts every other object
stated by Newton |
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mass
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the amount of matter in an object
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weight
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a measure of the force of gravity on an object
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inertia
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the tendency of an object to resist any change in motion
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Newton's First Law of Motion
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the scientific law that states that an object at rest will stay at rest, and an object in motion will stay in motion unless it is acted upon by an outside force
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phases
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one of the different appearances of the moon as seen from earth
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eclipse
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the partial or total blocking of one object in space by another
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solar eclipse
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the blocking of sunlight to earth that occurs when the moon is directly between the sun and the earth
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lunar eclipse
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the blocking of sunlight to the moon that occurs when the earth is directly between the sun and the moon
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umbra
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the darkest part of the shadow
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penumbra
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the larger less part of a shadow surrounding the darkest part
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tides
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the periodic rise and fall of the level of water in the ocean
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spring tide
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the tide with the greatest difference between consecutive low and high tides
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neap tide
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the tide with the least difference between the low and high tides
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telescope
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a device built to observe distant objects that makes them appear closer
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maria
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dark flat areas on the moon's surface caused by huge ancient lava flows
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craters
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a large round pit caused by the impact of a meteorite
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meteoroid
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a chunk of rock or dust in space
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