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16 Cards in this Set
- Front
- Back
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system
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A set of parts that affect each other.
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rotation
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one full spin of an object around an axis
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axis
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an imaginary line through the center of the earth
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revolution
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the movement of one object around another object, ex. Earth going around the sun
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a year
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the amount of time it takes the Earth to revolve around the sun
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a day
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the amount of time it take the Earth to rotate on its axis once
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gravity
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the force of attraction between two objects ex. gravity causes the Earth go around the sun and the moon to go around Earth |
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solar eclipse
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the moon blocks sunlight from reaching Earth
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lunar eclipse
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the Earth blocks sunlight from reaching the moon
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Earth's rotation
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causes day and night
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mass
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the amount of matter an object contains
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less mass
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objects with lees mass move more easily than objects with more mass. ex. the moon has less mass than the Earth so the moon orbits Earth
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weak gravity
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the greater the distance between objects the weaker the force of gravity between them
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strong gravity
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the closer objects are the stronger the force of gravity between the ex. moon and Earth
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day and night
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caused by the Earth's rotation
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rays
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the path sunlight travels away for the sun
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