What valuable materials are M-type (metallic) asteroids theoretically rich in?

Answer

Platinum-group metals, iron, and nickel.

Asteroids are categorized based on composition, with M-types representing metallic asteroids. These objects are theorized to be the exposed cores of larger, ancient protoplanets that underwent complete differentiation early in the Solar System's history. Because they represent these differentiated cores, M-types are hypothesized to contain substantial stores of valuable materials that are often scarce or difficult to extract from terrestrial sources. These resources primarily include heavy elements such as iron, nickel, and the platinum-group metals. Understanding the composition of these targets is the initial step toward evaluating the long-term feasibility of in-situ resource utilization (ISRU) for future space exploration endeavors.

What valuable materials are M-type (metallic) asteroids theoretically rich in?

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