Asteroids like Psyche 16, thought to be the core of a vanished planet, could be worth trillions. (Credit: Maxar/ASU/P. Rubin/NASA/JPL-Caltech)

What if the key to protecting our planet … was leaving it? Well, in part, at least. As worries about climate change mount, and the race to obtain resources from space heats up, some experts and über-rich CEOs are seriously considering moving our industry off-planet. That means using robots to build satellites and space stations by mining asteroids, th