What Kirin said. But also:
Go back to the very beginning of the comic, and Senku lays out three basic scenarios of who/how it happened. It’s never really brought up again, but if you’ve been paying attention to everything we’ve learned in the comic up to this point, it’s pretty easy for us to eliminate two of his three options with the information we’ve gained since. The Medusa-tech is just way too advanced to be man-made, and any human origin would thusly have either included time travel - which would have been an ass-pull, or involved ancient-precursors - also an asspull. Dr Stone as a comic has gone out of its way to be written with a certain amount of logical consistency/lack of ass-pulls. All of it designed to reinforce the comic’s core ethos of rationality and science. Of logical problem solving and the power of the scientific method. A lesser comic might have indulged in making Senku a secret Sayian, but Dr Stone has gone out of its way to make most of its plot devices reasonable/within the realm of plausibility, with the Medusa being the sole exception.
Go back to the very beginning of the comic, and Senku lays out three basic scenarios of who/how it happened. It’s never really brought up again, but if you’ve been paying attention to everything we’ve learned in the comic up to this point, it’s pretty easy for us to eliminate two of his three options with the information we’ve gained since. The Medusa-tech is just way too advanced to be man-made, and any human origin would thusly have either included time travel - which would have been an ass-pull, or involved ancient-precursors - also an asspull. Dr Stone as a comic has gone out of its way to be written with a certain amount of logical consistency/lack of ass-pulls. All of it designed to reinforce the comic’s core ethos of rationality and science. Of logical problem solving and the power of the scientific method. A lesser comic might have indulged in making Senku a secret Sayian, but Dr Stone has gone out of its way to make most of its plot devices reasonable/within the realm of plausibility, with the Medusa being the sole exception.