Did you know? Nothing on this planet above the specific gravity of Iron came from this solar system. Our heavy minerals on Earth, Venus, Mars and Mercury are the end result of an exploding super nova in a distant galaxy consuming and converting hydrogen into helium into Fe into Au etc etc. As above in holdfasts post, Nasa are hoping to captured an asteroid and transport it to our moon to be put in its orbit, so we can observe and study it with ease. It may have even been yesterday or the day before they captured it. Its game on.
The rosetta comet is another.
taken from Nasa:
Comets are time capsules containing primitive material left over from the epoch when the sun and its planets formed. By studying the gas, dust and structure of the nucleus and organic materials associated with the comet, via both remote and in-situ observations, the Rosetta mission should be a key to unlocking the history and evolution of our solar system, as well as answering questions regarding the origin of Earth's water and perhaps even life. Rosetta will be the first mission in history to rendezvous with a comet, escort it as it orbits the sun, and deploy a lander to its surface.
The comets may be an eventual sources of water for deep space flight and vehicles for us to travel though space, And, at the very least offer a better understanding of our own solar system.