Infrastructure must be built with materials, and it is not practical to launch anything from Earth into space.
Asteroid mining is one of those things that’s been talked about for decades but hasn’t happened.
If we want to have a real presence somewhere other than Earth, we'll have to use resources that are already in space.
There are enormous resources available in asteroids, especially in the Main Asteroid belt
There are more than 26,000 NEAs, and they could play a key role in humanity’s space-faring future.
The three categories are carbonaceous, metallic, and silicaceous, or C-Type, M-Type, and S-Type.
They’re also grouped by their orbits, and by families, with each member of a family coming from the same parent body.