Fermi's paradox roughly goes like this: Even if technological life is very uncommon, even if civilizations which colonizes the galaxy are uncommon among techno

Fermi's paradox roughly goes like this: Even if technological life is very uncommon, even if civilizations which colonizes the galaxy are uncommon among technological civilizations, even if galactic colonization is extremely slow and limited, on astronomical timescales it would still be trivial to colonize essentially every star in our own galaxy. From this we can conclude that there have been no colonizing civilizations in existence in the Milky Way at least prior to a few hundred million years ago because otherwise they would be everywhere including here (Earth, our Solar System). So either long-lived colonizing technological civilizations are vastly uncommon to an incredible degree (due to some internal or external factor limiting their longevity, perhaps), technological civilizations are far more alien than we could imagine, or humans happen to be one of the earliest technological civilizations in the Milky Way. Nothing in Fermi's paradox requires technology or physics that doesn't exist yet, it primarily relies on time. A million years is a long time for a technologically advanced species, ten million, 100 million, or a billion years is an unimaginable eternity. Even at slow travel times and very "half-assed" levels of colonization (taking thousands of years between founding a colony and sending out only a handful of new colony ships) the sheer amount of time in play allows for quite thorough colonization of the entire Milky Way.