" Yet, of all the people I have had approach me or e-mail me to say they have seen a UFO, not one has been an amateur astronomer. As a matter of fact, I have never heard about any amateur astronomers seeing something in the sky they absolutely could not explain. Yet they spend far more time looking at the sky than lay people and statistically should see far more UFOs! How can this be?

Easy. Remember, the amateur astronomers study the sky. They know what's in it and what to expect. When they see a meteor, or Venus, or sunlight glinting off the solar panel of a satellite, they know it's not an alien spaceship. Amateur astronomers know better and, in fact, all the amateurs to whom I have spoken about this are very skeptical about UFOs being alien spaceships. This is a very strong argument that there are mundane explanations for the vast majority of UFO sightings. "

― Philip Plait , Bad Astronomy