>>16756573
Telescopes get pointed basically every direction. Pic related is basically right at the south pole.
As for why probes aren't sent that way, well there isn't, or shouldn't be, much to see. Star dust condenses into a disk as the solar system forms so everything is kinda locked in that plane.
That and missions like voyager use the gravity of massive planets to "catapult" them to speed. Much more difficult to do something like that if you're not moving along the same plane.