Earth is tiny compared to what exists beyond it. Human civilization currently uses only a microscopic fraction of the Sun’s energy. Even if humanity increased its energy usage a million times over, it would still be almost nothing compared to the scale and power of the Sun. The Sun contains roughly 99.8% of the mass in the entire solar system. Everything else, including Earth, is incredibly small in comparison. Musk believes this is why civilization cannot remain Earth-bound forever. The long-term future of humanity depends on expanding into space where energy, resources and growth potential exist at an almost unimaginable scale. For a truly advanced civilization, space is not a side project. It’s the next frontier.