There are thousands and thousands of asteroids in space which are reachable from Earth. Many of these asteroids have large amount of minerals like Metals (Platinum, Iron etc) and water as well. The value of these minerals on the Asteroids has been estimated to be in trillions of dollars. Trillions of dollars worth of minerals are just orbiting out in space! What is stopping us from going and getting those insane amounts of resources? Nothing. It’s all out there for us to go and grab it.
We are about to colonize space. There is a second space race happening right now. This time the race is between private companies, not the governments. SpaceX is leading the way, but Vector, Boeing, Blue Origin and many others are catching up. The first private commercial human launch is happening in 2019. The US is going to Mars in 2027. Russia and China are sending humans to the Moon in 2031. The time is now.
Space is closer than it has ever been. We have regular flights to space, and we are almost about to go to Mars. Luxemburg just passed a space mining law that wants people to mine asteroids. Japanese have sent 2 successful Hayabusa missions to asteroids to get small fragments of those asteroids back. Companies like Planetary Resources and Deep Space Industries are preparing to commercially mine the asteroids.
If we want to become space explorers, we need to mine the asteroids. The cost to send one kg of resources into space from Earth is $10,000/kg. That makes space travel really expensive. Some asteroids are expected to have a ton of water which is a propellant. If we can mine the asteroids for water we can send missions to anywhere in the Solar System at a fraction of the cost.