I accidentally hit a thin black part of a ring that I didn't even know existed so I was never sure whether I completed a discovery or not after that. I have my name on some planets between the bubble and Orion Nebula so I'm satisfied with that.How come? They're really easy to hit. Missing them now, especially when approaching a station that orbits inside the rings, is the real trick.
You use a Krait Mk.II, four pips to shields, two pips to thrusters. Equipped with a fighter, three Pacifiers and a couple of (gimballed) Multicannon. Charge enhanced/super conduits 6A distributor holds 45.6 MJ fully charged. Each of the guns draws 1 MW average from the distributor, a total of 5 MW - which gives 45/5 = 9 seconds firing all five. The fighter doesn't need any power from the distributor at all. The guns dish out a total of 380 points of damage per second, so 9*380 = 3420 points before the cap is empty.
A stock Cobra has 153 points of shields against kinetics, and 180 points of hull, so 333 points from full to bang. The few occasions I got a random interdiction by a pirate in a Cobra, the fight was over before my FSD cooled down - those pirates have a tendency to try and scan you nose to nose, which is kind of not exactly a good idea against a ship equipped with Pacifiers (or frags) .
A stock FAS will hold out a bit longer - 221 and 450 points respectively, 671 points in total.
A stock Anaconda is still a bit more challenging - but also easier to hit. Still, 603 and 788 points, 1391 points in total - again possible as long as I don't miss (and the keep the SLF in the hangar).
Now add that one of the MCs runs corrosive ammo, which reduces hull strength by IIRC 30%, and things look even more grim for the NPCs.
And thanks for that second piece of advice. I left school a year early so that was like Latin to me. I've put it in a text file in case I need it later.
I was alright at maths though. In hindsight, it's probably your fault.