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| The study of the moon, stars, and other objects in space. |
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| The imaginary line that passes throughout Earth's center and the North and South poles. |
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| The spinning of earth on its axis. |
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| Is the movement of one object around another. |
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| Earth that follows a path as it revolves around the sun. |
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| Each of these days, when the sun is farthest north or south of the equator. |
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| Attracts all objects toward each other. |
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| Law of universal gravitation |
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| States that every object in the universe attracts every other object. |
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| Is the amount of matter in an object. |
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| force of gravity on an object |
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| The tendency of an object to resist a change in motion. |
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| Newton's first law of motion |
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| Says that an object at rest will stay at rest and an object motion will stay in motion with a constant speed and direction unless acted on by force |
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| The different shapes of the moon you see from earth. |
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| When an object in space comes between the sun and a third object, it casts a shadow on that object. |
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| Occurs when a new moon blocks your view of the sun. |
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| This larger part of it's shadow. |
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| Occurs at the full moon when earth is directly between the moon and the sun. |
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| The rise and fall of ocean water that occurs every 12.5 hours or so. |
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| Their combined forces produces a tide with the greatest difference between consecutive low an d high tides. |
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| A tide with the least difference between consecutive low and high tides. |
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| A device built to observe distance object by making them appear closer. |
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| Te moon's surface has dark, flat areas, witch Galileo. |
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| Galileo saw that the moon's surface is marked by large round pits. |
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| Chunks of rock or dust from space. |
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| Is a devise that expels gas in one direction to move in the opposite direction. |
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| The reaction force that propels a rocket forward. |
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| is the speed in given direction. |
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| Is the velocity a rocket must achieve to establish an orbit around earth. |
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| Is the velocity a rocket must reach to fly beyond a planet's gravitational pull. |
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| Is an object that resolves around another object in space. |
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| Is a spacecraft that can carry a crew into space, return to earth, and then be reused for the same purpose. |
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| Is a large artificial satettle on witch people can live and work for long periods. |
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| Is a space craft that carries scientific instruments. |
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| That moves around on the surface. |
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