[Lemmy]

Give it the 'sight obscuration' ability, which is a stellar ability, and everything in the sector, including the planet itself, will be invisible until you have sufficient sensors.

but this would also hide any ships in that ssector
What i wanted was to "cloak" tiny planets, uncolonized, untill you researched sensors good enough to detect them, but if you see enemy ships dissappearing in that sector, you would know there is something there.
Then my only hope for that is the way i posted it?