Today’s post is part of a special series here on Planet Pailly called Sciency Words. Each week, we take a closer look at an interesting science or science-related term to help us expand our scientific vocabularies together. Today’s term is:
In 1990, the Galileo spacecraft was on its way to Jupiter and needed to perform a gravity assist maneuver at Earth. This turned out to be a golden opportunity for science. Could a typical NASA space probe equipped with a standard suite of instruments detect signs of life on a planet where we already knew life existed?
In a 1993 paper, Carl Sagan and colleagues presented their findings in this “control experiment for the search for extraterrestrial life.” The paper explores all the things Galileo observed and, more intriguingly, some of the big things Galileo missed. Things like the “technological geometrization” of the planet’s surface, as the paper called it.
As far as I can tell, technological geometrization is not a term that’s stuck in the scientific lexicon, which is a shame. I think it’s a really good term. It refers to the way technologically advanced civilizations would tend to create geometric patterns on their surfaces of their planets.
The planet Coruscant from the Star Wars universe is a great example. The entire planet is urbanized, to the point that natural geological features are completely covered over. From space, all you can see are straight lines and perfect circles—efficient city planning on a global scale.
As another example, back in the 1800’s Percival Lowell and an embarrassingly large number of other astronomers thought they saw canals crisscrossing the surface of Mars. Those canals, if they really existed, would have been clear evidence of a technologically advanced society geometrizing their planet.
Earth’s surface displays only the faint beginnings of technological geometrization: rectangular patches of farmland and the grid patterns of streets and highways. These features are visible from space (Google Earth proves that), but you have to get fairly close to Earth to notice those kinds of details.
Apparently Galileo didn’t get close enough. At an image resolution of 1-2 kilometers per pixel, the technological geometrization of Earth was effectively invisible.
P.S.: That paper by Sagan and Company was a really good paper. It served as the basis for my recent “Alien Eyes on Earth” series.