This paper presents sighting reports, witness testimony, and a video, which combine to suggest that alien aircraft have the capability to be invisible. The paper examines reports dating from World War Ⅱ to the present, which illustrate invisibility to radar, optical invisibility, and directional optical invisibility according to the angle of observation. The paper also considers events associated with chemtrails and cattle mutilations, as well as abductee reports in which invisibility is inferred. In addition, the paper discusses a video, the 1989 Durea sequence, which portrays a craft transitioning into and out of an optically invisible state. The Durea sequence video will be shown with the spoken presentation of this paper at the 2005 MUFON Symposium. Finally, the paper examines a proposed technical mechanism to account for UFO invisibility, the bending of light in a gravitational field.
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