The galaxy is immensely vast and has been around for billions of years. Who knows what kind of life has already evolved and expanded?
more of a question of why they'd come light years then just sit on their asses in Saturn oblivious to the surrounding system
and if it was intelligent life in there instead of a natural occurrence, they'd have to be in there for decades because a decelerating starship entering the solar system would be as bright as a star if it relied on something known to science (bussard ramjets, lightsails, project orion propulsion)
great,here come another lie of how life began.
what