It seems obvious that both the planes and the bases were being observed, and in some cases photographed by remote-control units or manned space ships.

Although I thought it improbable that the location of our uranium deposits would be of interest to space men, a Washington official told me it would be relatively simple to detect the ore areas with airborne instruments.

“The Geological Survey has already developed special Geiger counters for planes,” he told me. “They had a little trouble from cosmic-ray noise. They finally had to cover the Geigers with lead shields. Whenever an important amount of radiation is present in the ground, the plane crew gets a signal, and they spot the place on their map. It’s a quick way of locating valuable deposits.”

When I told him what I had in mind, he suggested an angle I had not considered.

“Mind you,” he said, “I’m not completely sold on the interplanetary answer. But assuming it’s correct that we’re being observed, I can think of a stronger reason than fear of some distant attack. Some atomic scientists say that a super-atomic bomb, or several set off at once, could knock the earth out of its orbit. It sounds fantastic, but so is the A-bomb. It’s just possible that some solar-planet race discovered the dangers long ago. They would have good reason to worry if they found we were on that same track. There may be some other atomic weapon we don’t suspect, even worse than the A-bomb, one that could destroy the earth and seriously affect other planets.”

At the time, I thought this was just idle speculation. But since then, several atomic scientists have confirmed this official’s suggestion. One of these was Dr. Paul Elliott, a nuclear physicist who worked on the A-bomb during the war.

According to Dr. Elliott, if several hydrogen bombs were exploded simultaneously at a high altitude, it could speed up the earth’s rotation or change its orbit. He based his statement on the rate of energy the earth receives from the sun, a rate equal to some four pounds of hydrogen exploded every second. Still other atomic scientists have said that H-bomb explosions might even knock a large chunk out of the earth, with unpredictable results.

A dramatic picture of what might happen if the earth were forced far out of its orbit is indicated in the much-discussed book Worlds in Collision, by Dr. Immanuel Velikovsky, recently published by Macmillan. After many years of research, Dr. Velikovsky presents strong evidence that the planet Venus, when still a comet resulting from eruption from a larger planet, moved erratically about the sky and violently disturbed both the earth and Mars.

When the comet approached the earth, our planet was forced out of its orbit, according to Worlds in Collision. For a time, the world was on the brink of destruction. Quoting many authentic ancient records, including the Quiché manuscript of the Mayas, the Ipuwer papyrus of the Egyptians, and the Visiddhi-Magga of the Buddhists, Dr. Velikovsky describes the cataclysm that took place. “The face of the earth changed,” he writes in his book. The details, reinforced by the Zend-Avesta of the Persians, tell of tremendous hurricanes, of a major upheaval in the earth’s surface, of oceans rushing over many parts of the land, while rivers were driven from their beds. Some of the events in this period are mentioned in the Bible.

Professor Horace M. Kallen, former dean of the New School of Social Research, strongly endorses Dr. Velikovsky’s statements: “It is my belief that Velikovsky has supported his theses with substantial evidence and made an effective and persuasive argument.”