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106 From the long record of sightings, it was possible to get an answer to the second question. Observation of the earth followed a general pattern. According to the reports, Europe, the most populated area, had been more closely observed than the rest of the globe until about 1870. By this time, the United States, beginning to rival Europe in industrial progress, had evidently become of interest to the space-ship crews. From then on, Europe and the Western Hemisphere, chiefly North America, shared the observers’ attention. The few sightings reported at other points around the world indicate an occasional check-up on the earth in general. Apparently World War I had not greatly concerned the space observers. One reason might be that our aerial operations were still at a relatively low altitude. But World War II had drawn more attention, and this had obviously increased from 1947 up to the present time. Our atomic-bomb explosions and the V-2 high-altitude experiments might be only coincidence, but I could think of no other development that might seriously concern dwellers on other planets. It was a strange thing to think of some far-off race keeping track of the earth's progress. If Redell was right, it might even have started in prehistoric time; a brief survey, perhaps once a century or even further spaced, then gradually more frequent observation as cities appeared on the earth. Somewhere on a distant planet there would be records of that long survey. I wondered how our development would appear to that far-advanced race. They would have seen the slow sailing ships, the first steamships, the lines of steel tracks that carried our first trains. Watching for our first aircraft, they would see the drifting balloons that seemed an aerial miracle when the {p. 125} Montgolfiers first succeeded. More than a century later, they would have noted the slow, clumsy airplanes of the early 1900's. From our gradual progress to the big planes and bombers of today, they could probably chart our next steps toward the stratosphere--and aL we then space. CHAPTER XIV THAT EVENING, after my talk with Redell, the question kept coming back in my mind. What were they like? And what were they doing here?