Thanks for the reply! Indeed an actual Rama type artifact, i.e. the size of a small moon, would be impractical. I'm not sure if BDOs are at all possible in KSP, would be pretty sweet if they were. I was thinking more along the lines of like a derilict alien spaceship or a floating monolith, something along those lines, more Kerbal sized. Basically just an anomalous object that if you investigate it yields a lot of science etc. Maybe one of them could be a derelict alien ship with an OP engine that you could salvage, fix up and then fly around in? Like something that would appear once or maybe twice in your entire career play-through as an endgame thing.