Earth has an interesting property, where it’s got just enough gravity to hold water and air in just the right amounts. And just far enough away from the sun to

Earth has an interesting property, where it’s got just enough gravity to hold water and air in just the right amounts. And just far enough away from the sun to provide heat and cold. And that special magnetosphere to protect delicate life from being ionized by cosmic rays. You’ve gotta wonder if lava and plate tectonics has melted away all traces of any previous civilizations. Like, the entire crust would have to become an inferno. Maybe when the moon formed, from another planetary body colliding with the earth, that this cosmic event destroyed all previous civilizations on Earth, and made the planet inhospitable for a million years. And maybe if that civilization became space faring, if they left technological artifacts elsewhere in the solar system. Like on Mars. Or in the asteroid belts. Or perhaps, they were able to see the incoming collision, that they jettisoned from the solar system, and went to another star system in search of a new planet to call home.