Are Human Beings The Only Technologically Advanced Civilization In The Universe?
“There may never have been another intelligent, technologically advanced alien species in the entire history of the Universe. When you take into account that there may be 400 billion stars in the Milky Way, up to three potentially habitable worlds in many of these star systems, and some two trillion galaxies in the entire Universe, it seems like intelligent life is an inevitability. But our intuition can often lead us astray; what we feel is no substitute for science. The magnitude of the unknowns that abiogenesis, evolution, long-term habitability and other factors bring into the equation throws many of our assumptions about life into doubt. It’s true that there are an astronomical number of possibilities for intelligent, technologically advanced lifeforms, but the huge uncertainties make it a very real possibility that humans are the only spacefaring aliens our Universe has ever known.”
Given the huge number of stars, planets, and chances at life that the galaxy and the Universe has given us, it seems paradoxical that we haven’t yet encountered any form of alien intelligence or even life. The discoveries make in the field of exoplanet studies, particularly by the Kepler mission, make this an even bigger problem than we anticipated: more than 10^22 planets with Earth-like conditions are expected to exist in our Universe. But having so many chances, even with an astronomically large number like that, doesn’t necessarily mean we aren’t alone. The origin of life, the sustainability and development of complex, intelligent life, and the odds of technological success and ambition of a species that makes it are complete unknowns. We might enjoy thinking about these questions and exploring the Universe to hunt for answers, but the fact is that we don’t know.