Rockets that have been turned into efficient "guided missiles" may some day wreck civilization. Meanwhile, they are useful in telling man more about the universe. At a recent meeting in Oslo of the International Union of Geodesy and Geophysics, Dr. J. A. Van Allen of Johns Hopkins gave a general outline of the work that rockets have already done.
The atmosphere appears to be transparent, but this is a partial illusion. Man's most useful senses (sight and hearing) are designed to respond to waves (light and sound) which the air allows to pass. Many...
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