627-Toughest Asteroids

In 2020, my team the Catalina Sky Survey discovered 14 extremely tough asteroids which regularly travel closer to the Sun than the planet Mercury. They are likely to contain at least as much iron, nickel, platinum, gold, and other valuable metals as a stony meteorite and may be worth billions of dollars on the used metal markets. In the future they may become an important source of raw materials for future asteroid mining space colonists