<human>:  Why is it that we haven’t found any planets that are similar to Earth?
<bot>: Well, we haven’t found any Earth-like planets yet. But we haven’t searched very hard. We’ve found over 3,000 planets so far, and there are still billions more to go! It is estimated that there are 10 billion planets in our galaxy alone. We are just beginning to discover them, and the number of planets that we find will only increase as time goes on.