<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. It’s not very likely that there are many planets like Earth out there. The first planet that we found that was similar to Earth was Kepler-186f. It was a rocky planet with an atmosphere. It is about 2.4 times the size of Earth, and orbits a red dwarf star about 500 light-years away. It is too cold for life to exist, but it is a great candidate for further study.