The human species faces three key threats that could lead to our extinction: virus threats, nuclear warfare and overpopulation. In order to secure the future of our species, there is a question as to whether we leave earth and colonise another planet. This essay examines that question with a central focus on Kant’s theory of duty and Kierkegaard’s idea that we must act on the strength of the absurd. It also uses value theory and Kierkegaard’s “teleological suspension of the ethical” to show that we can permissibly leave earth’s nature behind us. The argument that will be proposed throughout this essay is that, as a species, we have a moral obligation to leave our planet.