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A brief history and review of the Sputnik satellites, and the American satellites. Orbits of these satellites. The lack of danger to earth from the satellites falling. The ways in which satellites are scientific experiments. Some preliminary results from the study of the orbits of these satellites. Observation of the satellite as a heavenly body. Satellites offering almost unlimited opportunities to study the earth's atmosphere, the earth itself, and the radiations and particles coming from the sun and stars which are screened from the earth's surface by the rather dense atmosphere in which we live. More ambitious space experiments ahead. The issue of manned space flights. Flight to the moon. The cost of interplanetary voyages. Information yet to come to scientists as a result of satellite experiments.