The paper appeared in "Nature" in December, 1973, with the title: "Is the Universe a Vacuum Fluctuation?" It proposed the idea that our universe had originated from a quantum fluctuation of the vacuum. The cosmologist Alexander Vilenkin said of the paper: "Now, what Tryon was suggesting was that our entire universe, with its vast amount of matter, was a huge quantum fluctuation, which somehow failed to disappear for more than ten billion years." Physicist Alan Guth made this comment about the paper: "In his controversial two-page paper, Tryon advanced the startling proposal that on rare occasions, whole universes might materialize from the vacuum, and our universe may have begun this way." This was the first time any scientist had used science to try to explain how our universe may have originated from nothing.