@EvaFox
Elon Musk: The sun is overwhelmingly the source of energy, and everything else is tiny potatoes π₯ βThe biggest source of energy by far is the sun. So nothing even comes close to the sun in terms of energy output. The sun converts over 4 million tons of mass to energy per second, and it's been doing that for a very long time, and will do that for many, many billions of years to come. So one of the ways you can think of the progress of any given civilization is on the Kardashev scale. And so just a simple way of thinking about it is, you're Kardashev level 1 if you've harnessed all the power of a planet. You're 2 if you've harnessed all the power of a solar system. And you're 3 if you've harnessed the power of a galaxy. We're very far from 3, it's safe to say, but even from 1. So when you think in Kardashev terms, it becomes very obvious that the sun is overwhelmingly the source of energy, and everything else is tiny potatoes, tiny, tiny, tiny potatoes. But hey, well, tiny potatoes are fine for now, but the sun is overwhelmingly the big potato, the humongous potato. So it's really harnessing the power of the sun that will lead us to the stars.β