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rapid approach and retreat were due to a thin, rapidly moving layer of mists which caused it to change intensity. Within the last year I have positively identified UFOs over Fort Collins, Colorado (pointed out to me usually by phone) as a weather kite, the planet Venus, and the stars Vega, Capella, Betelguese, and Sirius. Some of the stars close to the horizon flashed red, green, and white, and only a star chart and In many other cases, data are not quite complete enough to be positive, but one can state with a high degree of certainty that a given UFO was quite likely such and such a conventional object or phenomenon. One important conclusion becomes apparent: There is a very high noise level in UFO observations. This is exactly what one might expect. People do become excited by news stories and thereby predisposed to such experiences themselves. We cannot, however, from this high noise level write off the entire phenomenon as belonging to this category of conventional objects misinterpreted. Sagan (1963) attempted to do this by pointing out the great diversity which occurs within the sightings. This might well be only the noise. Even if spaceships are visiting us, many people are still seeing conventional objects and interpreting them as spaceships. The sightings which do not fit well into the conventional-objects-misinterpreted category have certain characteristics concerned primarily with the detail which is observed and with the nature and reliability of the witnesses. Sometimes other evidence is also available. If only a moving light is seen at a great distance, one can hardly be tempted to run out and meet our big brothers from Mars. Even a disc or a globe with fairly sharp-appearing edges might well be an optical effect of some sort. A report is more impressive when the object is seen at close hand, especially landed on the ground. A very distinct shape with highly distinct edges, and a solid, often metallic-appearing surface is described. Windows or other markings may be apparent. Lights are frequently an associated part of the observation, and sometimes (both day and night) the brilliance was said to be so high that the observer found it difficult to continue booking at the UFO. Occasionally, one part of the UFO is described as being in motion relative to other parts (the rim of a disc may be rotating around the disc.) "Occupants," both humanoid and otherwise, have been reported in conjunction with UFOs, landed and flying. The quality of a sighting is always enhanced when the time of observation is long enough for the observer to consciously consider what he is observing while he is observing it. A light that moves by in less than 5 seconds can hardly produce a very impressive account. In some other cases UFOs have much discussion could convince the viewer that he was not observing a spaceship. In the most interesting cases, the sighting seems absolutely to defy explanation in these terms. been observed for | or 2 hours or even longer. We are primarily concerned with witnesses. Their background and training are especially important,