When light ray enters in our atmosphere it bends fro its direction and we saw our sky blue.When any other thing goes in the atmosphere of any planet there is friction of the surrounding air on that object.In both cases we can detect the object or wave.
When an UFO appears in our earth atmosphere ,is there no change in any of our atmosphere cherestic so that object can be detected by our instruments.Is there no change in wave whan an UFO appear on earth.
