The RNA had still to originally come from somewhere. Big bang produced hydrogen and helium. Primordial stars converted those to heavier elements - carbon, nitr

The RNA had still to originally come from somewhere. Big bang produced hydrogen and helium. Primordial stars converted those to heavier elements - carbon, nitrogen... and at some point in time between the first stars exploding and spreading the heavier elements into the universe, and now, the first RNA molecules were formed. What was the chemical process that produced them is the specific question here. Not where in universe this happened. Although that question is exciting as well. Nothing stops from using Darwin's idea here as well - there was a puddle on a planet, somehwere else, long ago and far away... Panspermia makes the argument actually more complex, not simpler. But it's not unlikely - space is apparently full of rocks from far away places.