Word: electromagneticism
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U.S. intelligence learned of the mishap through ELINT (for electronic intelligence). Deployed on the ground, aboard reconnaissance aircraft, or inside ferret-type electronic satellites, ELINT's sensors can easily detect large explosions, even at great distances, from the electromagnetic disturbances that they cause in the atmosphere. If added proof...
To make his measurements, Weber and his colleagues built a gravitational wave detector of extraordinary sensitivity that can record extremely small stresses and strains caused in its own structure by the impact of gravity waves from distant space. But, Weber had to be able to differentiate gravity-wave pat terns...
It has been evident to astronomers for some time that solar disturbances occur in rather close harmony with the appearance of the sunspots. Thus there were fierce solar storms during and shortly after the record numerical peak in sunspots during 1957-58 and a long lull during the sunspot minimum...
The two main sorts of data collected by aircraft of this type are "Comint," for communications intelligence, and "Elint," for electromagnetic intelligence. "Comint" primarily means verbal radio messages while "Elint" covers such nonverbal signals as radar, automatic landing aids and computer traffic. Since the early 1950s, EC-121s have flown...
"What we are dealing with here is a problem of perception. Humans are equipped with an eye that perceives a very limited part of the electromagnetic spectrum, an ear that only perceive relatively low frequencies of vibrations, and a vocal apparatus that can only produce one sound at a time...