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unit 4 lesson 1
Question | Answer |
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Satellite | an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication. |
gravity | the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account. |
lunar phases | The different appearance of the moon from earth throughout the mouth |
eclipse | an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination. |
umbra | the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse. |
penumbra | the partially shaded outer region of the shadow cast by an opaque object. |