As pointed out by the likes of Martin Gardner, the science in "The Urantia Book" reflects the views that prevailed at the time the book originated. The claim by the authors, that no unknown scientific discoveries could be imparted, can function as a ruse to allow mistakes to be dismissed later. The appeal to convenience that post-1955 scientific knowledge is not being presented is consistent with a book written by humans in the 1950s instead of celestial beings with superior knowledge.