Stars in a dream usually point to guidance and aspiration -- a distant goal you're orienting yourself by, even if you can't yet see the whole path there. Countless stars filling the sky can reflect a hopeful sense of possibility, while a single, hard-to-find star may mirror a direction you're still searching for.
Mercury conflicts with those who are ruled by Jupiter, and Jupiter conflicts with those ruled by Mercury. - Picatrix (Andalusia, ~1000.AD)