Getting it to occur once is more likely than getting it to occur many times.  However, it does give you a new problem: making cells that can survive hard vacuum, radiation, and extreme cold, for millenia (at least), and still be viable when they reach a new planet.  We&#x27;re not talking speed-of-light propagation here.  We&#x27;re probably not even talking 0.01 c.  So even to the nearest neighboring star is probably thousands or tens of thousands of years.  In vacuum.  In extreme cold.  Without even photosynthesis to provide energy.  Yeah, I&#x27;m kind of skeptical of this actually working.