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moving or stationary, reflect. Solid objects send back only a small part of the waves towards the detection module, like a mirror reflects the light. This weak signal is amplified manifold and subsequently trans- lated on a screen in the form of a luminous plot. The latter moves on the screen in the same way as the detected object, depending on the selected distance scale. This is called primary detection (real signal). Modern aircraft are equipped with a transponder emitting an iden- tification code. This secondary detection, combined with kinematical data calculated by the device, provides an important amount of infor- mation (flight number, speed, flight level, rate of descent, etc.). The dif- ference between military and civilian air traffic controllers is that the first always work with primary detection, whereas the latter use only secondary detection. Materialized UFOs can therefore in theory be detected by radar. This has actually been reported by numerous stations, both military and civilian. However, there are countless cases in which the con- trollers did not detect any tangible signs. This absence of detection contradicts eyewitness accounts. It is said that UFOs have a stealth mode, just like certain modern military craft. This technique is essen- tially based on the dispersion of incidental waves generated by the angular contour or, on the contrary, a very round contour of the craft, which renders the radar incapable of amplifying even the slightest sig- nal. Materialized UFOs are often flattened disks that offer an ideal detection surface for air traffic controllers. How can they slip by unno- ticed and escape the sophisticated technology of military radar? It is suggested that they are made of graphite, which is known for its abil- ity to absorb electromagnetic waves, or even that they ionize the sur- rounding air, creating a protective cloak. We can notice the partial ionization of the atmosphere by the smell of “ozone” often reported in close contact. Nevertheless, this explanation does not suffice. The answer is still based on the same principle of the temporal bub- ble. The frequency of radar waves entering the temporal bubble of a vessel is inevitably changed. If this change is too significant and even if the vessel is materialized, the incidental frequency is no longer com- patible with the radar spectrum but exceeds it. It is thus possible to see a vessel with the naked eye, even when it is not picked up by radar. Its stealthiness, which is inevitably variable depending on the time density attained in the bubble, consists of modifying the detection fre- quency itself instead of changing the trajectory (principle of our own stealth planes). 342 The Science of Extraterrestrials: UFOs Explained at Last * Eric Julien