I mean odds are good it already happened a long time ago. Some space crap crashed into earth, spewing some rock covered in microbes into space where it eventual

I mean odds are good it already happened a long time ago. Some space crap crashed into earth, spewing some rock covered in microbes into space where it eventually collided with Europa. We have identified plenty of space crap from other planets and moons in our solar system that crashed into us. Granted the environment on our space probes is a little different than a shattered rock sent from an impact event but still…