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| when the sun reaches its highest & lowest point |
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| National Aeronautics and Space Administration. |
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| An object that orbits a more massive object. |
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| A satellite in which people can live for long periods. |
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| a craft designed to land on a planet's surface. |
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| A spacecraft that is sent into a planet's atmosphere or onto a solid surface. |
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| a device that gathers visible light or another form of electromagnetic spectrum . |
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| Radiation from a source seperated into a range. |
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| when one object casts a shadow onto another. |
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| An oval or flattened circle. |
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| Sunlight supplies life on Earth with light energy for photosynthesis. |
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| is the energy source for almost all life on Earth. |
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| is one of Earth's major land ecosystems, with its own animals,plants,soil,and climate. |
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| exist within and around bodies of water that contain little salt. these bodies of water include ponds,lakes,etc. |
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| Includes Tropical Rain Forest,Decidous Forest, etc. |
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| are biomes in which various species of grasses are the main form of plant life. |
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| dry,recieve less rain,on every continent. |
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| have very cold winters and short summers. |
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| is the average distance Earth is from Sun. |
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