Panspermia doesn’t only work (if it works) by microbes floating in space. Rather the idea is that microbes are embedded and somewhat protected in asteroids whic

Panspermia doesn’t only work (if it works) by microbes floating in space. Rather the idea is that microbes are embedded and somewhat protected in asteroids which then land somewhere habitable. The occasional close brushes between stars and their asteroid clouds provide the medium where microbes could be transferred between stars quickly enough to launch and land before the radiation destroys any hope of survival (like 20 thousand years.)