The hypothesis that life is seeded from comets then begs the question - how did it get onto comets in the first place? Did it evolve on our local comets? In co

The hypothesis that life is seeded from comets then begs the question - how did it get onto comets in the first place? Did it evolve on our local comets? In conditions which don't support life, over evolving on earth which does? Seems unlikely - so I assume we are talking about comets from other systems. Which makes me wonder how life got onto _those_ comets. Which suggests that life can leave a planet and get picked up by a local comet turned wanderer. Given the plethora of life on this planet presumably our comets are well endowed by now... I guess what I'm saying is that terestial evolution asks me to believe in one set of somewhat unlikely events - whereas cosmic evolution asks me to believe in the same events, just far far away, and then asks me to belive in "random space travel" (leaving as much as arriving) as well. Consider me sceptical.