Term
| oxygen-carbon dioxide cycle |
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Definition
| a natural cycle in which plants and other producers use carbon dioxide and produce oxygen, and living things use oxygen and produce carbon dioxide. |
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| a self sustaining natural system of living things and their environment |
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| a gigantic antenna designed to receive radio signals from space |
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| a continuous process in which water moves between the atmosphere and Earth's surface |
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| a being from outer space; any object from beyond Earth |
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| the motion of a freely falling object, such as a spacecraft in orbit around Earth |
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| The first radio telescope was built in ______. |
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| You could swallow in space without the help of a ____. |
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| When people breath, they take in __________ and release carbon dioxide. |
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| The ________ is a natural system that provides living things with all of their needs. |
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| Astronauts who come on board a space shuttle experience several changes in their bodies. One change that is most least likely to happen is the gain of ____. |
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| the way of estimating the chances of communication with extraterrestrials |
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| a space probe carrying a sound disk |
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| Search for Extra Terrestrial Intelligence using radio telescopes |
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| a form of electromagnetic radiation |
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