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| The study of the moon, stars, and other objects in space is called_____. |
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| the north and south poles is earth axis. |
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| the spin earth on its axis is called rotation. |
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| is the movement of one object around the another. |
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| earth follows a path or orbit as it revolves around the sun. |
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| the when the sun is farthest north of the equator. |
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| each of these days is known as an equinox which mean equal night. |
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| a force is a push or a pull. |
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| this force called gravity attracts all objects towards each other. |
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| law of universal gravitation |
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| newton's law of universal gravitation 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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| the force of gravity on an object is known as its weight. |
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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 in motion will stay in motion with a constant speed and direction unless acted on by a force. |
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| other time you see only a thin sliver the phases. |
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| it cast a shadow on that object causing an eclipse. |
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| a solar eclipse occurs when the moon passes directly between earth and the sun blocking sunlight from earth. |
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| the very darkest part of the moon's shadow the umbra |
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| this larger part of the shadow is called the penumbra. |
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| occurs at a full moon when the 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 produce a tide with the greatest difference between consecutive low and high tides. |
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| a tide with the least difference between consecutive low and high tides. |
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| a divice built to observe distant objects by making them appear closer. |
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| the moon's surface has dark flat areas which galileo called maria. |
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| galileo saw that there moon's surface is marked by large round pits called craters. |
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| now know that these crates were caused by the impacts of meteoroids chunks of rock or dust from space. |
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| is a device 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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| the greater the thrust the greater a rocket's velocity. |
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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 revolves 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 satellite on which people can live and work for long periods. |
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| is a spacecraft that carries scientific instruments that can collect data but has no human crew. |
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| that move around on the surface. |
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