Whilst exploring I went far away from a star to surface scan a huge gas giant. Scanner startet his job at 900ls and I wanted to continue to the next object, passing the gas giant but not even closely.
Alarm went off and I was thrown out of supercruise ... whaaaaaa ??? ... found myself in midst the huge asteroid ring around that gas giant. The very big ring system was almost invisibly dark against the blackness and so far out from it´s main star.
Similar thing happened to me only the ringed planet I was approaching was orbiting a black hole. The planet was totally unlit and the rings were completely invisible. I didn't know it had a ring system until I collided with it and then checked the system map. Luckily I only lost 2% hull and had 3 AFMU's on board for module repairs. Power plant only lost 1% and canopy was undamaged. I've been more careful since.