>be aliums
>niggerrig a rocket engine onto an asteroid
>cover said asteroid in sensors
>send it through neighboring star system

You now have a dirt cheap probe that looks like a normal space rock to anyone who’s not paying attention. Someone is watching us and they don’t want us to know it.

Ounuamua didnt look like that btw
it was a flat disk

>>16733982 (OP)

>did not even bother to say hi

Clear diplomatic insult!!

that's one way you'd do it. you can also mask your point of origin without too much difficulty.

they wouldn't want to emit anything, but passive and optical sensors wouldn't be detected by us.