Living on only one planet is a recipe for extinction no matter how perfect that planet’s environment is. Sooner or later it will get hit by an asteroid, or the

Living on only one planet is a recipe for extinction no matter how perfect that planet’s environment is. Sooner or later it will get hit by an asteroid, or the sun will go supernova or any one of a million other completely unpreventable natural disasters will happen. Being multi planetary is the only way to ensure the survival of humanity.