“They are different sizes?”
“Yes, in two senses of the word size. Radio waves are measured from crest to crest, which measurement is known as wave length. Since the invaders cover the entire dials of our radio sets and television sets it is obvious that either one of two things is true: Either they come in all crest-to-crest sizes or each one can change his crest-to-crest measurement to adapt himself to the tuning of any receiver.
`But that is only the crest-to-crest length. In a sense it may be said that a radio wave has an over-all length determined by its duration. If a broadcasting station sends out a program that has a second’s duration, a wave carrying that program is one light-second long, roughly 187,000 miles. A continuous half-hour program is, as it were, on a continuous wave one-half light-hour long, and so on.
“Taking that form of length, the individual invaders vary in length from a few thousand miles—a duration of only a small fraction of a second—to well over half a million miles long—a duration of several seconds. The longest continuous excerpt from any one program that has been observed has been about seven seconds.”
“But, Professor Helmetz, why do you assume that these waves are living things, a life form. Why not just waves?”
“Because `just waves’ as you call them would follow certain laws, just as inanimate matter follows certain laws. An animal can climb uphill, for instance; a stone cannot unless impelled by some outside force. These invaders are life-forms because they show volition, because they can change their direction of travel, and most especially because they retain their identity; two signals never conflict on the same radio receiver. They follow one another but do not come simultaneously. They do not mix as signals on the same wave length would ordinarily do. They are not `just waves.’ ”
“Would you say they are intelligent?”
Professor Helmetz took off his glasses and polished them thoughtfully. He said, “I doubt if we shall ever know. The intelligence of such beings, if any, would be on such a completely different plane from ours that there would be no common point from which we could start intercourse. We are material; they are immaterial. There is no common mound between us.”
“But if they are intelligent at all—”
“Ants are intelligent, after a fashion. Call it instinct if you will, but instinct is a form of intelligence; at least it enables them to accomplish some of the same things intelligence would enable them to accomplish. Yet we cannot establish communication with ants and it is far less likely that we shall be able to establish communication with these invaders. The difference in type between ant-intelligence and our own would be nothing to the difference in type between the intelligence, if any, of the invaders and our own. No, I doubt if we shall ever communicate.”