Elon Musk: "So you know, how do you achieve petawatt-level power? You need to build an electromagnetic mass drive on the moon, equipped with robots, Optimus Prime, and a huge human population. With that, you can launch petawatt-level energy. You can create petawatt-level computing power and send it into deep space because the moon has no atmosphere and gravity is only one-sixth that of Earth. So you don't need to use rockets on the moon; you can directly accelerate it to escape velocity, which again drastically reduces the cost of energy acquisition and allows you to reach 1,000 times the energy scale of terawatts. I hope we live to see the mass drive on the moon built, because that would be an absolutely spectacular sight."