So-called ” asteroid mining” company Planetary Resources is built on the belief that asteroids and other objects in space are loaded with resources that we can take advantage of, both here on Earth and as we begin to explore space in earnest. The essentially infinite supply of rocks floating through space, filled with valuable minerals that we’ll eventually run out of on our home planet, sounds like a great resource to take advantage of. But the idea of mining, processing and building with alien metals also sounds like a massive and daunting undertaking.