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from article
The astronomers have seen two distinct classes of objects: the spherical, definitely outlined ones, and the hazy, nebulous ones. Both have appeared to undergo intelligent manipulation and exhibit erratic motions. In all of these are features that have counterparts among the sightings listed by lay observers since 1947. Simultaneous observations by two or more observers have at times established the approximate distances of the UFO's through study parallax. ("Parallax" is the displacement, often measurable, caused by looking at an object from two different points; e.g. hold up a finger and view it with first one eye and then the other. The displacement against a distinct background is parallax.)