how is internal helpful to us?
what are satellites? how mobile
how mobile phone changes our life?
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In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon. On 4 October 1957 the Soviet Union launched the world's first artificial satellite, Sputnik 1.
Cell phones have enabled us to do various tasks all at the same time. Cell phones have also enabled families to keep in closer touch with each other. ... Cell phones have certainly made our lives much more convenient. Cell phones have also changed the way that people interact with each other.
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