Scientists are looking for earth like planets/bodies to find life on other planets/bodies, somewhere that is warm enough that liquid water can exist, and somewhere with basic organic molecules. Here's where I have a concern, in the 4 billion years of earths life, to our knowledge life had only emerged once(about 3.5 billion years ago). Since earth itself is the most earth like thing(obviously) how is it that we have not found life that had a different emergence. Does the earth maybe not have the best conditions for new life to emerge? I just think there should have been more then 1 root to all the living things that exist, or has existed, given that we believe earth has the prime condition for life. Maybe we're wrong about what is needed to create life?