Our knowledge of space is starting to match up with our ability to get out there an explore it. There are several companies working on missions and techniques to harvest minerals from asteroids. What other resources are out there that we can use?
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Asteroids on Wikipedia
What we can mine? Helium, water,
Do not use Helium!
Deep Space Industries
Mining asteroids could unlock untold wealth – here’s how to get started
Falcon Heavy Could Make Asteroid Mining a Reality