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Question | Answer |
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Astronomy | the study of the moon,sun,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 |
Rotation | the spinning motion of a planet on its axis |
Revolution | the movement of an object around another object |
Orbit | the path of an object as it revolves around another object in space |
Solstice | the two days of a year on which the sun reaches its greatest distance north or south of the equator |
equinox | the two days of a year on which neither hemisphere is tilted toward or away from the sun |
Gravity | force that attracts all objects toward each other; measured in Newtons. |
law of universal gravitation | every object in the universe attracts every other object |
Mass | the amount of matter in an object |
Weight | force of gravity on an object |
Inertia | the tendency of an object to resist change in motion |
Newton’s First Law of Motion | an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by an unbalanced force. |
Phase | 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 moon |
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 occurs when Earth is directly in between the sun and moon |