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photographs of Mars. These ideas have recently been discussed in considerably more detail elsewhere (Salisbury, 1966). There was an interesting correlation from 1948 to 1957 in the number of UFO sightings per unit time and the closeness to the planet Mars. This was shown by Vallee and Vallee (1962; 1966) to be expected on statistical grounds less than one time in a thousand. Both Venus and Jupiter are far more prominent in the skies than Mars (both have often been misinterpreted as UFOs), and yet no such correlation exists with their apparent brightness in the skies and the number of UFO sightings. space, can we really state with confidence that this is an impossibility? Do we know so much? Of course we do not. We are even searching for possible solutions to the problem of interstellar travel. Perhaps the most compelling "impossibility" argument is the reported physical activity of certain UFOs (Menzel and Boyd, 1963). In several "good" sightings (those which, for reasons discussed below, do not readily fit any of the remaining four hypotheses), UFOs have appeared to accelerate at tremendous rates or even make right-angle turns while traveling at speeds of several hundred or thousand miles per hour. Although they move in the atmosphere at velocities which surely exceed that of sound, no sonic booms are heard (they are often essentially silent) nor do they appear to burn up with frictional heat. The skeptic says: "Granted that we have a lot left to learn about our universe, we surely don't expect the fundamental laws to be rejected. That we may refine them as Einstein did, it is true, but inertia is inertia, and a right-angle turn at several thousand miles per hour is a simple physical This may be the most compelling argument against the spaceship hypothesis, but there are two counter- arguments. First, one can simply reject the above statement. I do not see how Newton's laws could be so flagrantly violated, but others (Lorenzen, 1962; Michel, 1958; Vallee and Val-l£e, 1966) have come up with various suggestions. Perhaps inertia is the gravitational interaction between an object and all other objects in the universe. If this gravitational attraction could some way be severed (some mysterious antigravity shield surrounding the spacecraft, for example!), then right-angle turns at high speeds might be feasible. Would the surrounding antigravity field also nullify the sound barrier problem? Some think so. I haven't the faintest idea, but we could be wrong about what is impossible. Second, one might remember that not all UFOs perform "impossible" feats. The topic is sufficiently interesting if only one UFO proves to be a spaceship from Mars! Another argument against the spaceship idea concerns the lack of formal contact with the UFO occupants. Since visiting spaceships ought to be piloted by some sort of intelligent beings, wouldn't it be reasonable to expect that they would desire contact with other intelligent beings, namely us? Or why hasn't a flying saucer landed on the United Nations Building to establish formal diplomatic relations? This argument assumes that we can understand the motives of an extraterrestrial being. Of course we cannot. How could we know the minds of such beings? To inductively extrapolate from our own current sociological approaches to those of other intelligent entities would be to commit the logical sin of extrapolation in a most flagrant manner. Assuming that there is no intelligence on Mars and that the UFOs would have to cross interstellar impossibility."