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Despite the lack of such evidence, many scientists favor the continuation of UFO investigations in the hope that they will lead to new discoveries about man's environment, while clearing up the uncertainty about saucers. But even after the most rigorous examination by contemporary science, it will be difficult to prove beyond doubt that there are no extraterrestrial saucers. Says Astronomer Hynek: "There is a tendency in the 20th century to forget that there will be a 21st century science, and indeed a 30th century science, from which vantage points our knowledge of the universe may appear quite different. We suffer, perhaps, from temporal provincialism, a form of arrogance that has always irritated posterity."