The point I'm making is that ALL evolution is pretty much dumb luck.

A lizard glides a bit with spread feathers that were evolved as a mating display, and away you go. The "selection" comes later. Nobody was thinking "bird" to begin with.

Nothing is going to evolve right off to be a spacegoing life form, but I could see simple life forms evolve characteristics on ice moons (radiation resistance, cold resistance, physical toughness, ability to be dormant for very long periods) that would enhance its survival on the moon, but by sheer coincidence, goes a long way to making a seed that could survive for long periods in space, too.

Of course, only on a small moon with low gravity would there be a likelihood of frequent ejection into space by natural processes.

One wonders what happens if such a spore hits a nice warm wet place like ancient Earth. Maybe the warmth kills it. Or maybe in a much more benign environment it takes off like kudzu...