Human civilization is on the verge of expanding beyond Earth's borders. More than a possibility, it is becoming a necessity: whether compelled by climate change and resource depletion, or compelled by future disasters, we shall one day construct our homes among the stars. This is a brief book that offers a completely different viewpoint on humanity's destiny. The future of humankind is frequently regarded as a subject for idle discussion. Nonetheless, our views and preconceptions about this topic impact decision in both our personal lives and public policy - decisions with very real and sometimes unfavorable repercussions. As a result, it is crucial to try to build a realistic way of futuristic cognition regarding big picture concerns for humankind.