ever since the asteroid hit We found riders... known privately as the it's they have been living it up and multiplying by the millions, eradication technique is unknown as they could survive any poison or blast, We have tried... Conclusion, they were on a distant planet with life , always on the brink of war much like ours, their arrival signifies that the world they were on had their war, the it's collect plant like genetics and spread their seeds across the universe rebuilding ecologies across vast distances, light years away... if they are collecting here, it could be a sign that we are the next planet to go. They have already introduced three new flower species as genetic mutants of a sun flower, you can see here.