Possible life in our solar system and stars within 100 light years are from the same source as ours?
Life came to Earth through comets. What if these comets harbor the same ingredients that brought life to our planets are from a same source whatever that may be. Then they spread within 100 years lights to planets. Earth were the only ones that through sheer coincidents managed to evolve into complex lifeforms and what see today. While on the other planets they didn't and are microscopic, single-celled organisms that adapted to endure harshed enviroments on moons and planets that even don't have oxygen. Maybe this could be explanation why we haven't heard from anybody yet.