Starrysky

Another older game, Sternenhimmel, 1995 (when, to play a decent game, you needed to dust off your O-level German).

It's a bluffing game, with some logical deduction.  Some sites in each constellation allow you to put a piece on face-down, only to be revealed when the constellation is full.  Most pieces are number values, but two double the value of neighbouring stars, and one is a black hole which removes all neighbouring stars before scoring starts.

No lined-up planets though.