Sky's not the Limit

Click for big - Asteroid mining as a maybe real thing by some rich dudes who've started a company. If you're super rich, why not? And if the crazy idea actually works, well, then you might become the richest men who've ever walked this precious metal barren planet. Richer than Crassus.

For you see, Earth differentiated - meaning, it melted. And most of the heavy stuff sank down deep into the planet. Far from our machines. And so we simply scrape around the surface - all the gold, silver, tin, iron, etc ever dug up but a pittance of what actually exists on Earth. But we'll never be able to get to it.

And so, space. Most of the time asteroids did not differentiate, and thus the precious metals are sitting in discrete chunks close to the surface. Some asteroids are almost entirely iron. More metal than mankind has ever know sits in just one or two 500M asteroid. Read this if you can:
I'll summarize the entire idea (which will eventually happen if we continue to advance as a technological species): 1. Find some good target asteroids. There are two general classes - water rich, and metal rich. 2. Get to them, and drag them to a Lagrange point. 3. There, mine them of water and metals. 4. Send some of the metal back to Earth for a very large price. Use the rest to build your space mining infrastructure to you can mine ever more asteroids.

Soon enough with this scheme and we'll have entered some post-scarcity wonder world of flying cars and giant space stations.
Also too: Underground cities in case some mad Gazillionaire decides to rain asteroids down upon the planet.

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