I keep getting wave warnings but no destination planet (it just shows question marks) and several times I've had no warning at all.
The waves in itself are not really difficult (my armored golem is chewing them up nicely) but since they appear every three minutes or so they are tying up my ships.
The problem is: I've had already read up on these and decided to scout all neighbouring planets in advance to rule out exactly this kind of nasty surprises when invading a new planet and I've found no trace of a raid engine.
Hmm, if you've really scouted all the adjacent planets and haven't put any military ships on them, and none of those planets are stealthed (or, potentially, a raid engine hiding under a stealth guard post... but I haven't heard anyone running into that), and none of them show a raid engine, then yea, it couldn't really be a raid engine.
Another reason waves can go to "? ? ?" is that there are no warp gates bordering your territory; it's usually best to always leave at least one. But those wouldn't generally be happening every 3 minutes.
Is there any way the AI could have built a raid engine or similar structure after I've scouted a planet or is this impossible ?
There's nothing in the game (currently
) that does that, no.
PS: is there any kind of a "noob questions" thread, because I always feel reticent about starting new threads about (I assume) fairly trivial beginner questions which is why I've posted this in the same one I started earlyer.
Feel perfectly free to ask questions, and if it's a different topic than an existing thread (or the existing thread has already come to a conclusion), then starting a new thread is the way to go