Every dog had its day.....
There could be many ways life can arise: We hypothesize that life could arise, (or at least steps along the road to life) anywhere liquid water and organic chemistry interacted. From what we can tell this was much more common in the deep past, when big impacts into icy bodies were common, and short lived isotopes were still putting out a lot of heat, so remnants of that time (mainly comets and asteroids, but some planetary surfaces are that old) are exactly the places to look for clues to lifes beginnings. Every chunk of ice we see today could have been an ocean world back then........