Twenty-nine years ago, as the Voyager 1 probe neared the edge of our solar system bound for interstellar space, NASA directed it to photograph the Earth from 4 billion miles away. The picture is known as "the pale blue dot." Our planet was barely detectable, about a single pixel in an image that astronomer Carl Sagan described as "a mote of dust suspended in a sunbeam."
From the lush surface of our world, its vulnerability is not apparent. By outer space standards, even the South Pole is extravagantly hospitable, but the "pale blue dot" expressed how infinitesimal we are in the cosmos. That Voyager scarcely picked out the earth from relatively nearby offers insight into how toilsome it is to find planets orbiting other stars. Despite the technological advances of the 20th century, the first "exoplanet" was not discovered until 1992.
It was a significant scientific achievement, but no surprise. As an astronomy enthusiast in the 1960s, I gazed at the stars and assumed our galaxy must be teeming with planets. Our sun had nine, and surely it couldn't be the only one among the staggering multibillions of stars. That wasn't a scientific deduction, but also no great conceptual leap for a child of the Space Age who had proof that the stars were other suns.
How wildly different for Giordano Bruno (1548-1600) the Renaissance philosopher and monk, who without observational evidence deduced that the stars were suns and they must have planets. He also said they were inhabited. One of his books, "On the Infinite Universe and Worlds," contained the sentence, "There is in the universe neither center nor circumference," thus anticipating by over three centuries the work of luminaries such as Albert Einstein. For that and other heresies, he was burned at the stake by the Inquisition.
Is it more remarkable that Bruno conjured such keen insights or that he terrified the Inquisitors? "Remarkable" in the literal sense, "worthy of mention." After all, Bruno was acutely religious, tending to mysticism; his pronouncement could've been magical thinking — a wild lucky guess — no more scientific than my childhood assumption of "it must be" or an imaginative plot device by a sci-fi novelist. Why should people feel threatened? They were, and that is remarkable.
In my adolescence I belonged to a fundamentalist Christian sect, subject to a strict code of behavior regulating every facet of life. Outsiders aware of our rules and doctrines considered them strange and oppressive. Why live under a totalitarian regime that dictated menus, hairstyles, sexual practices and reading lists, not to mention thoughts and ideas? For most insiders, however, including myself, the system was congenial. For a while.
I attended one of the sect's colleges, a bucolic campus in the East Texas woods, an alternate reality fashioned to reflect what the entire world was supposed to be when our god's plan waxed triumphant. Yes, we sometimes chafed under the strictures, but what kept us more or less happily in the fold (and happiness was mandatory) was a potent sense of belonging, a heady glow of earned righteousness, and a conviction of personal and collective exceptionalism. Everything was certain and we were the chosen. I had yet to discern, as Judge Learned Hand noted: "The spirit of liberty is the spirit which is not too sure it is right."
Ironically, or perhaps inevitably, it was in that restricted, rigorously enforced dreamland where many members comprehended the power of ideas: They could indeed threaten. If you value seamless fraternity, undoubted rectitude and special consideration from the divine, then everyone must stay on the same page. Doubt is contagious and toxic, the "new" is shocking, dissenting opinions are destabilizing and it all sums up to heresy. Heresy is to an authoritarian community as a suicide bomber is to a crowded café.