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ai dilation of time in the gradual field around the vessel allows sound frequencies to become infrasound. This stops shockwaves from being generated. Figure 112 While in a materialized state and moving at high speed, UFOs do not produce a supersonic boom because time is contracted around the vessel and the air gradually slows down as it reaches the hull. There is no shockwave because the relative velocity of the vessel is low compared to the ambient air inside the temporal bubble! How- ever, as the craft accelerate, their corpuscular appearance will take a vibratory form, in which case the aerodynamic load disappears. Before dematerializing the acceleration equals an increase of time density that compensates the growing pressure correlative to the acceleration. UFOs are also silent in the materialized state, because the frequency of the sound emitted by the vessel — which is in fact a shockwave that travels through the atmospheric gas — has slowed down to such an extent (“redshifted”’) that it becomes infrasound. What is heard in the extensive spectrum of frequencies generated by UFOs is an almost imperceptible sigh (a few kilohertz). Under certain non-material con- ditions this could be ultrasound. This explains why animals sense their arrival without seeing them, because unlike people they are endowed with ad hoc means of perception. 326 The Science of Extraterrestrials: UFOs Explained at Last * Eric Julien