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Article: Planetary Exploration
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- Space Sciences
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Copyright informationCOPYRIGHT 2002 The Gale Group Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Planetary Exploration
The exploration of space has been of interest to people since Nicholas Copernicus (1473-1543) and Galileo Galilei (1564-1642) discovered and described the true nature of the solar system. About 100 years ago, Russian Konstantin Tsiolkovsky (1857-1935) was the first scientist to describe the modern concepts of rocket engines and space travel. Tsiolkovsky, who wrote books about space travel, stated: "Earth is the cradle of humanity, but one cannot remain in the cradle forever."
In 1957 the Soviet Union surprised everyone by launching the world's first satellite, Sputnik. Only four years later, American amateur radio operators (hams) built and launched the world's ...
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