satelites

austin

satelites

World’s first ever satellite was launched on October 4, 1957 by Soviet Union. Weighing 183 pounds, it took around 98 minutes to orbit Earth. The seed of its invention was sown back in year 1952, when International Council of Scientific Unions came to a decision of establishing July 1, 1957-December 31, 1958 as International Geophysical yr. It was decided so because scientists knew solar activity cycle would be at high points around this time. And eventually, council took up a resolution calling launch of the artificial satellites during International Geophysical yr. for mapping Earth’s surface. By 20th century’s end, around 2,200 satellites were orbiting the planet with many of them offering scientific data with shots of earth that were not even imagined before. Along with latest imaging techniques, satellites bestow ordinary human beings with super sight. Remote sensing uses aerial photography and lets humans’ view, which is otherwise not possible with an unaided eye. Different techniques allow identification of vegetation, soil, seasonal crops, mineral resources and changes brought around by floods and storms. These are also use for detecting surface temperatures, finding out groundwater movements. The key ability of remote sensing device is that it can see energies in the wavelength that is not visible to the human eye. Remote sensing, which is just a step child of space age, is prying many innermost secrets of Earth.
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