Mining a single metallic asteroid would increase the supply of certain metals many fold: https://www.smithsonianmag.com/smart-news/asteroid-16-psyche-may-be-wo

Mining a single metallic asteroid would increase the supply of certain metals many fold: https://www.smithsonianmag.com/smart-news/asteroid-16-psyche-may-be-worth-more-than-planet-earth-at-10-quintillion-in-fine-metals-180979303/ https://www.smithsonianmag.com/smart-news/asteroid-16-psyche... And there are millions of these types of asteroids in the solar system. Extra-terrestrial resources also include the sunlight that is currently being beamed into empty space all around the Earth, that could otherwise be harvested by massive solar farms. There is millions of times more sunlight missing the Earth than reaching the Earth. Setting up an infrastructure for harnessing these resources would be a massive endeavor but once the infrastructure is set up, the amount of resources that come to be accessible to human civilization grows by orders of magnitude.