Our own fighter-planes can not be tracked on radar then can we track extraterrestrial using same radar system?
482962
Radar works because radio waves are reflected off of many objects. Stealth fighters are designed to hide from radar by minimizing the amount of radio waves reflected. I am sure a technologically advanced civilization could hide from our radar, however that would also imply that they want to. If they were trying to make contact, I am sure they could make sure we see them on radar.
563223
airport or maybe somewhere that they have radar  DUH !!!!
982460
Sure...you can always ask. many times, the police will just show you. They did the last time I was caught. The radar guns are calibrated regularly and are accurate within 5 km/h
1034438
I suppose we could find some sort of clear plexi-glass type of material that would be suitable for aircraft-grade structures, but making the entire plane clear would probably be impossible.  A materials science engineer would probably know more about this.\n\nOne question from me though: is there a need for this?  The stealth bomber, for example, flies so high that visual detection by ground based anti-aircraft emplacements is quite low.  So low, in fact, that I have heard that it has never been fired upon from the ground (don't quote me on that though).  So for modern military aircraft applications, I would say radar invisibility is far more important than visual invisibility.\n\nAs a side note, I had read about a clothing-like light scattering material in either Popular Science or the Spectum magazine (forget which).  Anyway, it somehow bends or scatters light in such a way as to partially reveal what is behind the covered object.  There was a picture of a guy wearing a piece of it, and I was pretty amazed.  It was far from perfect (could still obviously see the guy), but I could imagine it being a very useful camo material if it improves.
618873
This is a fascinating subject that is rarely discussed.  I have read supposedly legitimate reports that both the United States and the Soviet Union have employed people with so-called "remote sensing" capabilities to locate distant people and places.\n\nFor example, the government is looking for a new chemical factory.  One program I saw showed a dramatization in which the "remote seers" were put in a room, and hour by hour they would come closer and closer to pinpointing the exact location of what was being sought.\n\nDouble blind tests were done, and if the reports are true, remote sensing is a legitimate psychic phenomena.  When the remote seers located the desired person or object, the amount of detail provided by them was amazing.  These psychics claim the ability to actually see in their mind's eye the object of the search.  They produced drawings, sometimes showing very concrete details that could not be racked up to coincidence.
462356
It probably requires a mass spec technique.  Infrared might work.  Your detection level will be the problem.
930263
Amazing the amount of engineering effort that has gone into guided missiles.\n\nGenerally it is necessary to "lock on" to a target using some type of signal (heat in the case of "heat seeking"). The electronics that record the signal needs to have "quadrature" at least ; it provides a different signal or indication to tell the quadrant ((+,+), (+,-),(-,-) or (-,+)).\nThe direction of the missile is then adjusted by the use of compressed gas jets often located near the nose.\n\nOf course there are many way to do this and the newest technology is IR video imaging with computer target recognition etc.
597459
It was a well thought,well designed aircraft that absorbed\nradar waves.\nThe blended wing and fuselage design made it less reflective overall. The coating is absorptive and the quarter wavelength thickness makes the incident and reflective waves being canceled out each other.It's composite material is absorptive to radar waves.\nHeat emission is minimum since it is shielded and mixed with cold air outside. So the infrared detection is difficult.\nIt is so sweet because it is battle field proven,it works.\nThe B-2 's radar cross section is minimum that makes B-2 very useful and practical.It is radar elusive and evading.
939171
"...From my own intelligence work within the military, I can say WITH ALL CERTAINTY that one of the main reasons the public has been kept in total darkness about the reality of UFOs and 'aliens', is that the truth of the matter actually exists TOO CLOSE TO HOME TO DO ANYTHING ABOUT.  How could a spokesman for the Pentagon dare admit that five or ten thousand feet underground EXISTS AN ENTIRE WORLD THAT IS 'FOREIGN' TO A BELIEF STRUCTURE WE HAVE HAD FOR CENTURIES? How could, for example, our fastest bomber be any challenge to those aerial invaders when we can only guess about the routes they take to the surface; eluding radar as they fly so low, headed back to their underground lair?"\n\n"...the 'Greys' or the 'EBEs' have established a fortress, spreading out to other parts of the U.S. via means of a vast underground tunnel system THAT HAS VIRTUALLY EXISTED BEFORE RECORDED HISTORY..."\n\n--Milton (William) Cooper, ex-Naval Intelligence officer
310445
i believe in ufo s.  there must be other life in the universe. more advanced than us. probably watching us now destroying our own planet. i have read accounts of pilots in world war two .ufo s flying near planes just watching the pilots and observing us.
735278
I think they did.  I was in the Army, and when I was..any soldier could look at a little dot on the horizon, and tell you what kind of vehicle it was...just by looking. Now these soldiers that first showed up at the roswell crash site, they initially put out a statement saying that it was in fact a downed U.F.O. then a few days later, that statement was retracted, and the story about it being just a weather balloon surfaced. I'm telling you, there's no way that trained military personel were standing right over this thing, and couldn't tell the difference between a balloon and a spaceship.
617922
stealth technology is based on a number of things but the way it works is on fighter jets that are stealth there bodies are emitting a very low electrical current (lower than commercial planes) the stealth bombers that the American army uses the reason they are claimed to be undetectable to radar is because the current and exhaust in those are spread out on a very thin line from the rear of the plane which makes them virtually undetectable (although its been proven that they are not in fact undetectable just very hard to pick up on radar but yes the answer to you're question is stealth on planes works because the planes are made of a combination of highly sensitive metals which (soak up so to speak) the electrical current that radars emit to detect planes as for anything else stealth I'm not sure sorry...
876796
Dear sir, \n       First, I submit that by UFO you are meaning an extraterrestrial aircraft.\n       \n      Now, here is the deal.  The universe is so large that it LITERALLY is proven mathematically that there are other life forms in the universe.  However, it is also true that they could not have visited earth.\n       Have you noticed that all of the reports started right after 1954's Roswell incident?  And that all the ships are different?  If it truly is an alien race, which it is not, how could it be that so many different alien ships have came and gone without real contact?  It is impossible.  Also, an alien aircraft would be seen by not only the FBI but everybody who observes space in any way.  There would be no way to hide it. \n       In conclusion.  Yes, there are aliens.  No, they have never been to Earth, and they will not for many, many years.\n       \nAs a final word.  Radio Transmissions (The fastest thing in the universe, the same speed as light) will take about 25,000 years to reach the Milky Way.  How could an alien species go for that magnitude of time, get to Earth, and turn away?  And furthermore, aliens are just like us and would we go on a thousand year expedition?
293091
Airplanes do show up on weather radar, but they are filtered out to avoid clutter.  Birds and swarms of bugs can also appear on radar, as can temperature inversions.  In fact, the debris trail from the Space Shuttle Columbia as it disintegrated made a very vivid image on weather radar.
849164
Most often, especially for low speed applications, it is a matrix of carbon fibers in a foam substrate.  At higher speeds, carbon fiber composites can be used, but radar waves can even be reflected from insulating materials (due to the change in dielectric constant between air and the material).  Many of these things reflect very poorly, though.  Coating the front of your car would not likely help with the local police radar -- however.
310421
Are we alone? Probably not. It would be fairly conceited to think otherwise. What is the 'grand secret' the government doesn't want us to know? I really doubt there is any secret. I don't believe any foreign intelligent life has ever visited the earth. Frankly, if they have the technology to cover the vast distances to visit us, then they would have no interest in doing so. If it was the land they were interested in, then we would not be hear anymore. They probably could anihalate us in the blink of an eye.
25218
Stealth jets, especially the F-117 use a special radar anti-reflective coating and sharp angles to deflect radar signals making them hard to detect on radar and you can't find something if you can't detect it, unless you have a ground spotter calling in coordinates but by the time it is called in the jet has already flown over.  The engine on a stealth jet are also designed to minimize heat exhaust and run cooler than your average jet engine, again, making it hard for heat tracking missiles to lock on.  The skin of a stealth jet, namely the F-117 make it very unstable and requires almost complete computer control during flight, though the pilot can make manual course corrections, it's stability during flight is maintained by a computer without the computer the jet would be too unstable for a human to fly.\n\nThey are stealth to some extent and they mostly fly at night, also, rain somewhat dulls the effects of the special coating and sharp angles of the plane so they typically fly at night in either cloudy or clear skies and in those conditions, they are very, very hard to find.  A F-117 appears to a radar, if it sees it at all to be a small bird like a seagull.\n\nDon't ask what the coating is made of, it is classified.