Everything we learn about exoplanets and solar system formation seems to point more and more toward the rarity of our planet. We circle the right sort of star in the Goldilocks part of our galaxy, which is a good galaxy for us. Our planet is in the right place and is the right size. It has this nearly impossibly large moon that helps make large tides that probably had much to do with evolutionary steps that resulted in complex animals. It also stabilized our obliquity. We have plate tectonics and a substantial magnetic field. We had an unlikely asteroid encounter 65 million years ago, exactly when mammals were ready for prime time. Exit dinosaurs stage left. Enter mammals center stage.

We cannot assign exact probabilities to all of the steps, but we can see how unusual and rare our planet really is. There are not trillions of copies in this universe.