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Definition
| the study of the moon, stars and other objects in space |
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| an imaginary line that passes through Earth’s center and the North and South poles, about which Earth rotates |
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Definition
| the spinning motion of a planet on its axis |
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Definition
| the movement of an object around another object |
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Definition
| the path of an object as it revolves around another object in space |
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| a push or pull exerted on an object |
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| a force that moves rocks and other materials downhill; the force that pulls objects toward each other |
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| Law of Universal Gravitation |
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Definition
| the scientific law that states that every object in the universe attracts every other object |
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| the amount of matter in an object |
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| the force of gravity on an object |
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Definition
| the tendency of an object to resist a change in motion |
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Term
| Newton’s First Law of Motion |
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Definition
| the scientific law that states that 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 a force |
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Definition
| one of the different apparent shapes of the moon as seen from Earth |
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Definition
| the partial or total blocking of one object in space by another |
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Definition
| the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth |
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Definition
| the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon |
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Definition
| the daily rise and fall of Earth’s waters on its coastlines |
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| a device built to observe distant objects by making them appear closer |
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Definition
| a device that expels gas in one direction to move in the opposite direction |
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Definition
| a spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose |
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Definition
| a large artificial satellite on which people can live and work for long periods |
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| a spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew |
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Definition
| a small robotic space probe that can move about the surface of a planet or moon |
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